Amplifying’ Random Numbers Brings a Breakthrough in Digital Security OPEC+ Decides on Fourth Oil Quota Hike Amid Global Supply Disruptions Zojila Tunnel Between Kashmir and Kargil Sees Final Breakthrough National Family Health Survey-6 (NFHS-6): Gains, Gaps and the Debate over Missing Indicators Fifteen FTAs, 27 Countries, Four Challenges

‘Amplifing’ Random Numbers Brings a Breakthrough in Di

Source: Nature / The HinduSubject: Science & Technology

Why in News?

Researchers at ETH Zürich (Switzerland) have successfully demonstrated Randomness Amplification, a breakthrough quantum protocol capable of converting imperfect random numbers into certifiably perfect randomness. The achievement provides a new foundation for secure cryptography, digital authentication, blockchain systems, and future quantum-safe communication networks.

Key Highlights

• Scientists generated certified perfect randomness using principles of quantum mechanics.
• The experiment relied on quantum entanglement and a Bell test to produce inherently unpredictable outcomes.
• The protocol successfully amplified weakly random inputs into randomness that can be mathematically verified.
• Researchers produced more than 45 million certified random bits during the experiment.
• The method is device-independent, meaning the randomness remains trustworthy even if the hardware itself is not fully trusted.
• The breakthrough has important implications for cryptography, military communication, financial systems, blockchain networks, and quantum-secure digital infrastructure.

Why is Randomness So Important?

• Modern digital systems depend heavily on random numbers. Every secure online transaction, encrypted communication, digital signature, banking application, military communication network, and cryptocurrency system relies on random numbers for generating cryptographic keys.
• The strength of encryption depends directly on how unpredictable these numbers are.
• If an attacker can predict even a small pattern in supposedly random numbers, the entire security framework becomes vulnerable.
• The challenge is that most real-world random number generators are not perfectly random. Even highly sophisticated systems often contain subtle biases arising from hardware imperfections, environmental influences, or algorithmic limitations. Such imperfections may create hidden vulnerabilities that can be exploited by attackers.
• Thus, generating truly unpredictable randomness has remained one of the most important problems in information security.

The Scientific Breakthrough

• The ETH Zürich team addressed this challenge using one of the most fundamental features of quantum mechanics—quantum entanglement.
• Quantum entanglement refers to a phenomenon in which two particles become linked in such a way that measuring one instantly determines the state of the other, regardless of the distance separating them.
• Importantly, the outcomes of these measurements are fundamentally unpredictable and cannot be predetermined by classical physical laws.
• To exploit this property, researchers conducted a Bell test, a well-established experimental method used to distinguish quantum behaviour from classical behaviour.
• In the experiment, entangled quantum particles were separated by approximately 30 metres and measured independently. The results produced a Bell violation score significantly above the classical threshold, confirming that genuine quantum effects were responsible for the observed outcomes.

Breaking the Santha–Vazirani Barrier

• The achievement is particularly important because it challenges a long-standing limitation proposed by mathematicians Miklós Santha and Umesh Vazirani in 1986.
• Their work demonstrated that classical computers cannot transform a weakly random source into a perfectly random one through conventional computational processing. This became known as the Santha–Vazirani limit and represented a major theoretical obstacle in cryptography.
• The ETH Zürich experiment shows that quantum mechanics provides a pathway around this limitation. By leveraging non-classical quantum correlations, weak randomness can indeed be amplified into certifiably perfect randomness.

What Makes the Discovery Unique?

• A particularly notable feature of the protocol is its device-independent nature.
• Most existing random number generators require users to trust the hardware manufacturer and assume that the device is functioning correctly.
• If the hardware is compromised or manipulated, the generated numbers may not be truly random.
• In contrast, the new protocol does not rely on trust in the device itself. Instead, the validity of the randomness is guaranteed by the fundamental laws of quantum physics and verified through Bell-test statistics.
• This means that even if users have limited knowledge of the internal functioning of the hardware, they can still be confident about the quality of the randomness produced.

Significance

• The breakthrough represents a major milestone in the evolution of secure digital infrastructure.
• For cryptography, it offers the possibility of generating encryption keys whose unpredictability can be mathematically verified rather than merely assumed. This could significantly strengthen cybersecurity systems against increasingly sophisticated attacks.
• In blockchain ecosystems, certified randomness can improve fairness in consensus mechanisms, lotteries, gaming platforms, and smart contracts.
• Financial institutions may use such randomness for secure transaction validation and fraud prevention.
• The technology could also support the development of public randomness beacons—trusted public sources of randomness that can be used by governments, scientific institutions, and digital platforms to ensure transparency and fairness.
• From a broader perspective, the work establishes randomness as a measurable and certifiable physical resource, much like atomic clocks established a universal standard for timekeeping.

Challenges

• Despite its scientific significance, the technology remains at an experimental stage.
• The current system is slower and more resource-intensive than commercially available random number generators.
• Large-scale deployment will require improvements in efficiency, scalability, and cost-effectiveness.
• The experimental setup also depends on advanced quantum hardware and precise laboratory conditions, limiting immediate commercial adoption.
• Another important limitation is that perfect randomness alone does not solve the broader challenge posed by future quantum computers.
• Existing cryptographic systems will still require the adoption of post-quantum cryptography to remain secure against powerful quantum attacks.

Way Forward

The ETH Zürich experiment demonstrates that quantum mechanics can provide a fundamentally new standard for randomness and digital trust. As quantum technologies mature, randomness amplification could become a foundational component of future cybersecurity architectures, secure communication networks, digital identity systems, and financial infrastructures. Continued advances in quantum hardware, device-independent protocols, and post-quantum cryptography will be essential for translating this scientific breakthrough into practical applications capable of safeguarding the digital economy in the coming decades.

2.OPEC+ Decides on Fourth Oil Quota Hike Amid Global Supply Disruptions

Source: The HinduSubject: International Relations / Economy / Energy Security

Why in News?

OPEC+ has announced its fourth consecutive increase in oil production quotas despite major disruptions in global oil supplies caused by geopolitical tensions in West Asia. The decision comes amid continuing concerns over disruptions in the Strait of Hormuz, one of the world’s most important oil transit routes, and reflects efforts to stabilize global energy markets facing supply shortages and rising crude oil prices.

Key Highlights

• OPEC+ agreed to increase oil production targets for the fourth consecutive month.
• Seven major OPEC+ producers decided to raise output quotas by an additional 188,000 barrels per day (bpd).
• The increase follows earlier quota hikes implemented between April and June 2026.
• Actual production remains below targets due to geopolitical disruptions affecting exports.
• The Strait of Hormuz remains a major source of concern for global energy markets.
• The United Arab Emirates (UAE) has exited OPEC after nearly 60 years of membership.
• The developments have raised concerns regarding energy security, inflation, and economic growth worldwide.

OPEC+: Background and Structure

• OPEC+ is an alliance of the Organization of the Petroleum Exporting Countries (OPEC) and major non-OPEC oil-producing nations led by Russia.
• Established in 2016, the grouping seeks to coordinate petroleum production policies and maintain stability in global oil markets.
• The coalition includes major producers such as Saudi Arabia, Iraq, Iran, Kuwait, Algeria, Russia, Kazakhstan, and Oman. Together, OPEC+ accounts for nearly half of global crude oil production and controls a substantial share of the world’s proven petroleum reserves.
• The primary objective of OPEC+ is to regulate global oil supply through coordinated production cuts or increases, thereby preventing excessive price volatility and ensuring stability in international energy markets.

Why Has OPEC+ Increased Production Quotas?

• The latest production hike must be viewed against the backdrop of increasing concerns over global oil availability.
• Recent geopolitical tensions in West Asia have disrupted oil exports from key producing regions.
• Although OPEC+ members have raised production targets, actual supplies reaching international markets remain constrained because of transportation bottlenecks, infrastructure disruptions, and security concerns affecting shipping routes.
• The quota increase is therefore being viewed largely as a confidence-building measure intended to reassure markets that producers remain willing to supply additional oil whenever conditions permit.
• The move also reflects concerns that prolonged supply shortages could trigger sharp increases in oil prices and aggravate inflationary pressures across major economies.

Strait of Hormuz: Strategic Importance

• Around 20 million barrels of oil per day pass through the Strait of Hormuz, making it the world’s busiest oil transit chokepoint.
• Nearly one-fifth of global petroleum consumption and about one-third of seaborne oil trade move through this narrow passage.
• About 20–25% of global LNG trade, largely from Qatar, transits through the strait.
• It serves as the only sea outlet for major Gulf oil producers such as Iraq, Kuwait and Qatar.
• More than 60% of India’s crude oil imports from the Gulf region depend on uninterrupted navigation through the strait.
• The strait links the energy-rich Persian Gulf with the Arabian Sea–Indian Ocean maritime network, connecting West Asian energy supplies to Asian markets.
• Any disruption can immediately affect major Asian energy importers such as India, China, Japan and South Korea.
• It is a key factor behind the strategic importance of the Fifth Fleet of the United States, headquartered in Bahrain.
• Control over the strait provides Iran with significant geopolitical leverage during regional crises.
• Closure or militarisation of the strait can push up global crude prices within days, affecting inflation and growth worldwide.
• The vulnerability of the strait has encouraged Gulf countries to develop alternative pipelines, such as the East-West Pipeline in Saudi Arabia and the Abu Dhabi Crude Oil Pipeline in United Arab Emirates.
• The strait is central to discussions on energy security, maritime security, freedom of navigation, and supply-chain resilience in the Indo-Pacific and West Asian regions.

UAE’s Exit from OPEC

• A significant development accompanying the latest OPEC+ decision is the departure of the UAE from OPEC.
• For several years, the UAE had expressed concerns regarding production restrictions imposed under OPEC agreements. As one of the fastest-growing oil producers, it sought greater flexibility to expand output in line with its investment plans and long-term energy strategy.
• By leaving OPEC, the UAE gains complete autonomy in determining its production levels and export policies.
• The move reflects evolving dynamics within the global energy sector and highlights differences among oil-producing nations regarding future production strategies.

Significance

• The latest developments have important implications for global energy security. The current situation demonstrates that even when producers are willing to increase output, geopolitical conflicts and disruptions in transportation routes can severely limit actual supplies.
• The developments also underline the close connection between energy markets and inflation.
• Rising crude oil prices increase transportation costs, manufacturing expenses, and electricity generation costs, thereby contributing to inflationary pressures across economies.
• For India, which imports more than 85% of its crude oil requirements, sustained increases in oil prices can widen the current account deficit, weaken the rupee, increase inflation, and raise fiscal pressures. The situation reinforces the importance of energy diversification, strategic petroleum reserves, renewable energy expansion, and green hydrogen initiatives.
• The developments further indicate changing patterns in global energy governance. .

Challenges

• A major challenge is the widening gap between announced production targets and actual supplies reaching global markets. Political instability, regional conflicts, sanctions, and maritime disruptions continue to constrain production and exports despite higher quotas.
• Another concern is the long-term cohesion of OPEC+. Differences among members regarding production policies, market share, and responses to the global energy transition could weaken collective decision-making.
• Simultaneously, the rapid expansion of renewable energy technologies is creating uncertainties about future demand for fossil fuels and the long-term relevance of oil cartels.
• For oil-importing countries such as India, persistent volatility in global energy markets poses risks to economic growth, inflation management, and energy security planning.

Way Forward

The latest OPEC+ decision highlights the growing influence of geopolitical developments on global energy markets. While production quota increases may provide temporary reassurance, long-term stability will require secure supply chains, reduced geopolitical tensions, and diversified sources of energy. For India, the current situation reinforces the need to strengthen strategic petroleum reserves, accelerate renewable energy deployment, expand green hydrogen production, and reduce dependence on imported hydrocarbons. Building a resilient and diversified energy ecosystem will be essential for ensuring energy security and sustaining economic growth in an increasingly uncertain global environment.

3.Zojila Tunnel Between Kashmir and Kargil Sees Final Breakthrough

Source: The HinduSubject: Infrastructure / Internal Security / Geography

Why in News?

The Zojila Tunnel, one of India’s most strategically significant infrastructure projects, achieved its final breakthrough on 9 June 2026 in the presence of Union Minister for Road Transport and Highways, Nitin Gadkari. The tunnel will provide all-weather connectivity between the Kashmir Valley and Ladakh, overcoming the long-standing challenge of winter closure at the Zojila Pass.

The project is expected to transform regional connectivity, strengthen military logistics, boost tourism, and improve socio-economic integration in the border region.

Key Highlights

• The Zojila Tunnel has achieved its final excavation breakthrough, marking the completion of the most challenging construction phase.
• The tunnel is being constructed at an altitude of approximately 11,578 feet in the Himalayas.
• It will connect Baltal in Kashmir with Minamarg in the Drass-Kargil region of Ladakh.
• The tunnel is 13.14 km long, making it one of the longest road tunnels in Asia.
• The project cost is estimated at over ₹6,800 crore.
• Travel time across the Zojila section will reduce from nearly three hours to about 20 minutes.
• It will provide year-round connectivity to Ladakh, which currently remains cut off during winter because of heavy snowfall.
• The project has major strategic significance for military deployment and logistics along the Line of Actual Control (LAC).

Background

• The Zojila Pass is located on the Srinagar–Leh National Highway (NH-1) and serves as the principal gateway between the Kashmir Valley and Ladakh.
• For decades, the pass has remained vulnerable to heavy snowfall, avalanches, landslides, and extreme weather conditions. Every winter, transportation through the pass is disrupted for several months, isolating Ladakh from the rest of the country and creating serious logistical challenges.
• To overcome these constraints, the Government of India approved the construction of the Zojila Tunnel as part of a broader strategy to strengthen border infrastructure and ensure uninterrupted connectivity in the Himalayan region.

Strategic Importance

• The tunnel is among the most important border infrastructure projects undertaken in recent years.
• Ladakh has emerged as a strategically sensitive region following increased military deployments along the Line of Actual Control. Ensuring uninterrupted movement of troops, military equipment, fuel, food supplies, and emergency resources has become a national priority.
• Previously, large quantities of supplies had to be stockpiled before winter because road access remained blocked for several months.
• The tunnel will eliminate this dependency by ensuring year-round transportation regardless of weather conditions.
• The project therefore enhances India’s military preparedness, logistical flexibility, and strategic resilience in the northern border region.

Engineering Features

• The Zojila Tunnel represents a major engineering achievement given the challenging Himalayan terrain.
• The tunnel has been constructed using the New Austrian Tunnelling Method (NATM), which is particularly suitable for unstable geological formations and high seismic zones.
• It is a single-tube, bi-directional, two-lane tunnel designed to facilitate smooth vehicular movement. Advanced safety infrastructure, including ventilation systems, fire safety mechanisms, emergency exits, communication systems, and real-time monitoring facilities, is being incorporated into the project.
• Construction has been carried out under extremely difficult conditions involving high altitude, severe winters, fragile geology, and seismic vulnerability.

Related Infrastructure Initiatives

• The Zojila Tunnel forms part of a broader effort to strengthen connectivity in India’s Himalayan frontier.
• The recently completed Z-Morh Tunnel has already improved access to Sonamarg by providing all-weather connectivity in that sector.
• Similarly, the Atal Tunnel in Himachal Pradesh has significantly enhanced connectivity along the Manali-Leh axis.
• Together, these projects reflect India’s long-term strategy of improving infrastructure in border areas to support both civilian development and national security objectives.

Significance

• The successful breakthrough of the Zojila Tunnel demonstrates India’s growing capability in executing complex infrastructure projects in high-altitude and geologically challenging environments.
• The project will reduce regional isolation, strengthen economic integration, improve disaster response capabilities, and provide a reliable logistical corridor for military operations.
• It also highlights the increasing importance of infrastructure as a critical component of national security and border management.

Challenges

• Despite the breakthrough, several challenges remain before the tunnel becomes operational.
• The remaining phases involve tunnel lining, installation of safety systems, communication infrastructure, ventilation facilities, and final finishing works.
• The fragile Himalayan ecosystem also requires careful environmental management to minimise ecological impacts.
• Additionally, long-term maintenance of such infrastructure in extreme climatic conditions will require continuous investment and technological support.

Way Forward

The completion of the Zojila Tunnel marks a transformative step in India’s Himalayan infrastructure development. Going forward, timely completion of the remaining works, integration with other strategic road networks, and adoption of advanced safety and monitoring systems will be essential. Alongside strengthening military logistics, the focus should also remain on promoting sustainable tourism, regional economic development, and environmental conservation. As India seeks to improve connectivity in border regions, projects such as the Zojila Tunnel will play a crucial role in enhancing both national security and inclusive development in the Himalayas.

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4.National Family Health Survey-6 (NFHS-6): Gains, Gaps and the Debate over Missing Indicators

Source: The HinduSubject: Governance / Health / Social Issues

Why in News?

The National Family Health Survey-6 (NFHS-6) Fact Sheet (2023–24) was released on 29 May 2026, covering around 6.8 lakh households across India (except Manipur). While the survey records notable improvements in several health and social indicators, it has also generated significant debate due to the removal of nearly 30 key indicators, including anaemia, mortality rates, sanitation coverage, sex ratio at birth, and access to clean cooking fuel. The changes have raised concerns regarding the continuity of data and the ability to track long-term public policy outcomes.

Key Highlights

• NFHS-6 reports improvements in child nutrition, maternal healthcare, institutional deliveries, women’s digital access, and reduction in domestic violence.
• The survey marks a major methodological shift, with 43 indicators removed and only 13 new indicators added.
• Important indicators such as anaemia prevalence, infant mortality, under-five mortality, neonatal mortality, sanitation coverage, clean cooking fuel use, and sex ratio at birth are no longer included.
• New indicators focus on digital inclusion, direct benefit transfers (DBTs), self-help group participation, financial transactions, and testing for Hepatitis-B and Hepatitis-C.
• The survey reveals a decline in child stunting and spousal violence but also records concerns regarding exclusive breastfeeding and modern contraceptive use.
• Experts have welcomed improvements in several outcomes but questioned the omission of indicators that have traditionally formed the backbone of India’s health and development monitoring framework.

About NFHS

• The National Family Health Survey (NFHS) is India’s largest and most comprehensive health and demographic survey.
• It is conducted by the International Institute for Population Sciences (IIPS), Mumbai, under the supervision of the Ministry of Health and Family Welfare. Since its inception in 1992-93, NFHS has served as the principal source of nationally representative data on population, nutrition, fertility, mortality, maternal and child health, gender issues, and household living conditions.
• Unlike many administrative databases, NFHS provides district-level estimates and socio-economic disaggregation, enabling policymakers to identify regional disparities and target interventions effectively.

Major Findings of NFHS-6

The survey highlights encouraging progress across several dimensions of human development.

Improvement in Child Nutrition

India has recorded a notable decline in child stunting, indicating improvements in nutritional outcomes and maternal-child healthcare services. This suggests progress in programmes such as Poshan Abhiyaan, Integrated Child Development Services (ICDS), and various nutrition interventions.

Better Maternal and Child Healthcare

Institutional deliveries, skilled birth attendance, antenatal care, and postnatal care coverage have improved further, reflecting better healthcare access and expansion of public health infrastructure.

Decline in Domestic Violence

The prevalence of spousal violence has declined significantly from around 29% in NFHS-5 to about 22% in NFHS-6. This trend points towards greater awareness, improved legal protections, and increased social empowerment of women.

Digital Inclusion of Women

Women’s internet usage has increased substantially, reflecting the rapid expansion of digital connectivity, smartphone penetration, and digital literacy initiatives across the country.

Anaemia

• Anaemia has been one of the most closely monitored health indicators in India due to its widespread prevalence among women and children.
• The government has justified its exclusion by citing methodological concerns. Earlier NFHS rounds relied on finger-prick blood samples, which some researchers argued tended to overestimate anaemia prevalence.
• To address this issue, anaemia monitoring has now been shifted to the Diet and Biomarkers Survey in India (DABS-I) conducted by the ICMR-National Institute of Nutrition, which uses venous blood sampling and more sophisticated laboratory testing.
• However, experts argue that removing anaemia from NFHS makes it difficult to compare trends with previous rounds and weakens continuity in public health monitoring.

New Indicators Added in NFHS-6

While several traditional indicators have been removed, NFHS-6 introduces a set of indicators reflecting changing developmental priorities.

The survey now captures information on:

• Direct Benefit Transfer (DBT) coverage.
• Membership of Self-Help Groups (SHGs).
• Digital literacy and internet usage.
• Digital financial transactions.
• Testing for Hepatitis-B and Hepatitis-C.
• Financial inclusion and access to government welfare systems.

These additions reflect India’s increasing focus on digital governance, financial inclusion, and social empowerment.

Significance of NFHS-6

• NFHS remains one of the most important evidence-based policy tools in India.
• Its findings influence planning and monitoring across multiple sectors, including health, nutrition, women and child development, education, sanitation, and social welfare.
• The survey also contributes significantly to measuring progress towards Sustainable Development Goals (SDGs) and informs the calculation of India’s Multidimensional Poverty Index (MPI).
• The latest survey captures an important transition in India’s development journey.
• While traditional concerns such as undernutrition remain relevant, emerging challenges such as obesity, lifestyle diseases, digital inclusion, and social protection are becoming increasingly important.

Concerns and Challenges

• The principal concern surrounding NFHS-6 is the loss of continuity in long-term datasets. Many of the removed indicators have been tracked consistently for decades, allowing policymakers and researchers to assess trends over time.
• The shift of certain indicators to separate surveys may improve technical accuracy, but it risks creating fragmentation in the data ecosystem. Different surveys often have different methodologies, periodicities, and geographical coverage, making comparisons difficult.
• There are also concerns that the removal of sanitation, cooking fuel, mortality, and anaemia indicators may reduce the ability to directly evaluate the effectiveness of major government programmes.

Way Forward

The evolution of NFHS reflects India’s changing developmental priorities, but this transition must be carefully managed. While introducing new indicators related to digital governance, financial inclusion, and emerging health challenges is necessary, it should not come at the cost of losing critical long-term health and development metrics. Future survey rounds should seek a balance between continuity and innovation by retaining core indicators while incorporating new policy priorities. Greater coordination between NFHS and specialised surveys such as the Diet and Biomarkers Survey and Sample Registration System will also be essential to ensure that policymakers continue to receive comprehensive, comparable, and reliable evidence for informed decision-making.

5.Fifteen FTAs, 27 Countries, Four Challenges

Source: The HinduSubject: Economy – International Trade

Why in News?

India’s FTA with Oman came into force on June 1, 2026, taking India’s total Free Trade Agreements (FTAs) to 15 agreements covering 27 countries. With nine more agreements under negotiation, concerns are emerging regarding their impact on trade deficits, domestic manufacturing, and the Make in India initiative.

Key Highlights

• India currently has 15 FTAs covering 27 countries.
• Nine additional agreements involving 42 countries are under negotiation.
• India’s trade deficit has increased sharply with major FTA partners:
  • ASEAN: +381%
  • Japan: +318%
  • South Korea: +268%
• New FTAs with UAE, Australia, Mauritius and EFTA countries resulted in a combined trade deficit exceeding $50 billion in FY25.
• Indian exporters utilise only 20–30% of available FTA benefits, whereas import-side utilisation is estimated at 60–70%.

Four Major Challenges Associated with India’s FTAs

1. Rising Trade Deficits

While FTAs were expected to boost exports, imports from partner countries have grown much faster. India’s relatively high MFN tariffs (around 12.6%) mean foreign exporters gain substantial access to the Indian market when tariffs are reduced, whereas Indian exporters often receive limited additional benefits because partner countries already maintain low tariff regimes.

2. Low Utilisation by Indian Exporters

Indian firms often fail to fully utilise FTA preferences because compliance with Rules of Origin requirements, certification procedures and documentation costs frequently outweigh the limited tariff advantages available in partner markets. As a result, a large share of potential export benefits remains untapped.

3. Worsening Inverted Duty Structure

FTAs can create situations where imported finished products enter India at low or zero duty while domestic manufacturers continue to pay duties on imported raw materials and components. This raises production costs for Indian industry and undermines the competitiveness of domestic manufacturing.

4. Relocation of Manufacturing

Companies may increasingly prefer manufacturing in countries such as ASEAN members and export products duty-free to India under FTA provisions. This risks diversion of investment, employment and production away from India, weakening the objectives of Make in India and Atmanirbhar Bharat.

Significance

FTAs remain important instruments for expanding market access, attracting investment, integrating into global value chains and strengthening strategic partnerships. However, their success must be assessed not merely by the number of agreements signed but by their impact on exports, industrial growth, employment generation and economic competitiveness.

Way Forward

India’s FTA strategy must focus on improving export competitiveness alongside trade liberalisation. Simplifying Rules of Origin procedures, addressing inverted duty structures, aligning industrial policy with trade policy, and strengthening domestic manufacturing capabilities are essential. Future trade agreements should ensure that increased market access translates into higher exports, greater value addition within India, and stronger integration into global supply chains rather than creating long-term dependence on imports.