Why in News?

In late December 2025 India test-fired the indigenously developed K-4 submarine-launched ballistic missile (SLBM) from the nuclear-powered submarine INS Arighaat in the Bay of Bengal. The K-4 carries a nuclear warhead to a range of about 3,500 km, and the trial was reported as the first launch of the weapon from this newly commissioned boat.

The test matters because the K-4 anchors the sea leg of India’s nuclear triad — the survivable second-strike platform that underpins the No-First-Use (NFU) doctrine and credible minimum deterrence.

• Missile tested: the K-4, a solid-fuel, two-stage SLBM with a range of roughly 3,000–3,500 km, developed by the Defence Research and Development Organisation (DRDO).
• Launch platform: INS Arighaat, an Arihant-class nuclear ballistic-missile submarine (SSBN) commissioned on 29 August 2024 and operated by the Strategic Forces Command.
• Warhead capacity reported at about 2–2.5 tonnes; the missile design draws on the Agni-III family.
• As reported by the Times of India and noted by The Week, there was no formal Ministry of Defence statement on the launch — common for strategic, nuclear-capable systems.

The development matters in the context of:

• India holds nuclear weapons under a declared No-First-Use posture, which makes a survivable retaliatory capability — not a first strike — the doctrine’s centre of gravity.
• Submarines on patrol are the hardest leg of the triad to detect and destroy, so an SLBM with intercontinental reach extends deterrence credibility deep into the Indo-Pacific.

UPSC Relevance

Prelims Relevance

• K-4 SLBM: range ~3,500 km, solid-fuel, two-stage, DRDO-developed.
• K-15 (Sagarika): shorter-range SLBM, ~700–750 km, India’s first sea-launched ballistic missile.
• K-5 and K-6: longer-range SLBMs under development.
• INS Arihant: India’s first indigenous SSBN; INS Arighaat is the second boat of the class.
• INS Aridhaman: third Arihant-class SSBN expected to join the fleet.
• Strategic Forces Command (SFC): manages India’s nuclear arsenal under the Nuclear Command Authority.
• Nuclear triad: land (Agni missiles), air (aircraft-delivered bombs), sea (SLBMs on SSBNs).
• SSBN vs SSN: SSBN carries strategic ballistic missiles; SSN is a nuclear-powered attack submarine.
• No-First-Use (NFU) and credible minimum deterrence: pillars of India’s 2003 nuclear doctrine.
• Agni-V: land-based ICBM with 5,000+ km range, the longest-range Indian missile in service.

Mains Relevance

GS Paper 3

• Significance of the sea-based deterrent for India’s national security and assured second-strike capability.
• Role of indigenous DRDO programmes and self-reliance (Atmanirbhar Bharat) in strategic-weapons development.

GS Paper 2

• How a credible triad shapes India’s deterrence posture and stability in the Indo-Pacific maritime theatre.

Essay

• Deterrence, doctrine and restraint: does a stronger second-strike capability make a region safer or more fragile?

Background and Context

What is the nuclear triad?

A triad spreads nuclear weapons across three independent delivery platforms so that no single attack can disarm a state.

• Land leg: silo- and road-mobile ballistic missiles — India’s Agni series, including the 5,000+ km Agni-V.
• Air leg: gravity bombs and stand-off weapons carried by fighter aircraft.
• Sea leg: SLBMs fired from SSBNs patrolling silently at sea — the most survivable and hardest to pre-empt.
• The sea leg is what converts a deterrent from vulnerable to assured, because a hidden submarine can retaliate even after a first strike on land targets.

The K-4 missile

The K-4 is the workhorse SLBM that gives India’s SSBNs meaningful strategic reach.

• Range: about 3,000–3,500 km, a major jump over the earlier K-15 (Sagarika) at roughly 700–750 km.
• Propulsion: solid-fuel, two-stage design, reported to draw on the Agni-III lineage.
• Payload: capable of carrying a nuclear warhead of about 2–2.5 tonnes.
• Developed by the DRDO as part of the larger K-family of underwater-launched missiles.
• Longer-range successors — the K-5 and K-6 — are under development to extend reach further.

INS Arighaat and the SSBN fleet

India is steadily building a small but capable fleet of nuclear-missile submarines.

• INS Arihant: the lead boat, India’s first indigenously built SSBN, gave the country an operational sea-based deterrent.
• INS Arighaat: the second Arihant-class boat, commissioned on 29 August 2024, with design refinements over the lead vessel.
• INS Aridhaman: the third boat of the class, expected to be inducted, will deepen continuous-patrol capacity.
• The boats operate under the Strategic Forces Command, the tri-service body that handles delivery of nuclear weapons.

Second-strike capability and NFU

A survivable sea leg is the technical basis of India’s declared nuclear doctrine.

• India’s 2003 nuclear doctrine rests on No-First-Use and credible minimum deterrence.
• NFU only deters an adversary if retaliation after a first strike is certain — that certainty is what a hidden submarine provides.
• An SSBN on patrol can ride out a surprise attack on land-based forces and still deliver an assured second strike.
• Decisions to release weapons rest with the civilian-led Nuclear Command Authority, with the SFC as the executing arm.

Strategic and regional significance

The test signals maturing capability in a contested maritime neighbourhood.

• A ~3,500 km SLBM lets a patrolling boat hold distant targets at risk without venturing into vulnerable waters.
• It strengthens deterrence stability across the Indo-Pacific amid an expanding regional submarine and missile competition.
• Indigenous development reinforces strategic autonomy and reduces dependence on imported delivery systems.
• As a nuclear-capable system, such trials are typically conducted quietly, without the publicity that surrounds conventional-missile tests.

Way Forward

Deepen the SSBN fleet

• Induct additional Arihant-class boats, including INS Aridhaman, to sustain a credible continuous-at-sea deterrent.
• Invest in quieter propulsion, longer endurance and survivable command-and-control links for submerged boats.

Complete the missile ladder

• Operationalise longer-range SLBMs (K-5, K-6) so patrol boxes can stay well clear of adversary anti-submarine zones.
• Pair missiles with reliable re-entry and warhead systems while keeping arsenals to minimum deterrence levels.

Sustain indigenous R&D under the DRDO and Indian Navy, protect strict secrecy around strategic platforms, and keep doctrine, command structures and confidence-building measures aligned so capability growth supports — not erodes — regional stability.

Conclusion

The K-4 launch from INS Arighaat is less about a single missile and more about closing the gap between a declared doctrine and the hardware that makes it credible. A survivable sea leg turns India’s No-First-Use pledge from a statement of intent into an assured retaliatory capability.

For an exam, the durable takeaways are the structure of the nuclear triad, the role of SSBNs and the Strategic Forces Command, and why second-strike survivability sits at the heart of credible minimum deterrence.

UPSC Practice Questions

Prelims MCQ 1

With reference to India’s nuclear-capable missile systems, consider the following statements:

1. The K-4 is a submarine-launched ballistic missile with a range of around 3,500 km.
2. INS Arighaat is an Arihant-class nuclear-powered ballistic-missile submarine.
3. The K-15 (Sagarika) has a longer range than the K-4.

How many of the above statements are correct?

(a) Only one (b) Only two (c) All three (d) None

Answer: (b) Only two

Explanation:

Statements 1 and 2 are correct. Statement 3 is wrong: the K-15 (~700–750 km) is far shorter-ranged than the K-4 (~3,500 km).

Prelims MCQ 2

Which of the following best describes India’s ‘nuclear triad’?

(a) Three types of nuclear warheads of differing yields (b) Three independent platforms — land, air and sea — for delivering nuclear weapons (c) A three-nation nuclear alliance in the Indo-Pacific (d) Three command levels in the Nuclear Command Authority

Answer: (b) Three independent platforms — land, air and sea — for delivering nuclear weapons

Explanation:

The triad means delivery by land-based missiles (Agni), aircraft, and sea-based SLBMs on SSBNs, ensuring a survivable second strike.

UPSC Mains Questions

1. Examine how a survivable sea-based deterrent strengthens the credibility of India’s No-First-Use nuclear doctrine. Why is second-strike capability central to credible minimum deterrence? (250 words)
2. Indigenous strategic-weapons programmes are as much about strategic autonomy as about firepower. Discuss with reference to India’s SSBN and submarine-launched ballistic missile capabilities. (250 words)

Sources: Army Recognition (citing Times of India) and The Week.

Frequently Asked Questions

Why in News?

The Delhi government launched the Atal Canteen scheme on December 25, 2025, the birth anniversary of former Prime Minister Atal Bihari Vajpayee, to provide subsidised cooked meals to the city’s urban poor and daily-wage workers.

NewsOnAir (Prasar Bharati) reported that 45 canteens became operational on launch day, with the remaining canteens to open within a fortnight, taking the network towards a planned total of 100 canteens selling a meal for just Rs 5.

• Launched by Chief Minister Rekha Gupta on 25 December 2025, Atal Bihari Vajpayee’s birth anniversary.
• 45 canteens inaugurated on day one; 55 more targeted within roughly 15 days, towards 100 canteens overall.
• Each meal is priced at Rs 5, served as lunch and dinner to the needy and working people.
• Scheme outlay is around Rs 104 crore, managed by the Delhi Urban Shelter Improvement Board (DUSIB).
• Designed to serve roughly 1,000 people per canteen, scaling to about 1 lakh beneficiaries daily at full rollout.

The development matters in the context of:

• Sits in a lineage of state-run subsidised-meal schemes that treat affordable food as a welfare entitlement.
• Addresses urban food insecurity, a gap left by ration-based schemes that assume a fixed home and kitchen.
• Operationalises the spirit of the right to food, linked to Article 21 and the Directive Principles.

UPSC Relevance

Prelims Relevance

• Atal Canteen scheme — Delhi, launched 25 December 2025; Rs 5 meal.
• Implementing body: Delhi Urban Shelter Improvement Board (DUSIB).
• Outlay around Rs 104 crore; target of 100 canteens.
• Named after former PM Atal Bihari Vajpayee (birth anniversary, 25 December).
• Comparable schemes: Indira Canteen (Karnataka), Amma Unavagam (Tamil Nadu), Annapurna Rasoi (Rajasthan).
• Right to food derives from Article 21 read with DPSP Articles 39(a) and 47.
• National Food Security Act, 2013 — statutory backbone of subsidised food in India.
• JJ clusters — jhuggi-jhopri (slum) settlements that DUSIB administers in Delhi.

Mains Relevance

GS Paper 2

• Welfare schemes for vulnerable sections and the mechanisms for their implementation.
• Issues relating to development and management of social sector services like food security.
• Role of state governments and parastatal bodies (DUSIB) in last-mile welfare delivery.

GS Paper 3

• Public Distribution System, food security, and the limits of grain-based entitlements in cities.
• Subsidies, fiscal sustainability, and targeting in welfare programmes.

Essay

• Food is not charity but an entitlement: the welfare state and the right to live with dignity.
• Cities feed the nation but starve their own poor — the case for urban food security.

Background and Context

What the scheme provides

Atal Canteen offers a hot, sit-down meal at a token price to anyone unable to afford a market meal.

• A cooked meal at Rs 5, served as both lunch and dinner.
• Targeted at people from weak economic backgrounds and daily-wage workers across Delhi.
• Access through a token system for eligible persons at fixed hours.
• Each canteen is designed to feed about 1,000 people a day, reaching roughly 1 lakh at full scale.

Who runs it and what it costs

The scheme is anchored in an existing Delhi parastatal rather than a fresh bureaucracy.

• Implemented by the Delhi Urban Shelter Improvement Board (DUSIB), which already manages JJ clusters and night shelters.
• Reported outlay of about Rs 104 crore for the rollout.
• Phased launch: 45 canteens on 25 December 2025, with the balance to follow towards 100.
• Locating canteens near slums, markets, and labour hubs keeps the meal within walking distance of those who need it.

Why urban food insecurity is a distinct problem

Grain-based welfare assumes a settled home; the urban poor often have neither a stable address nor a kitchen.

• Migrant labourers and the homeless frequently lack a local ration card, leaving them outside the standard PDS net.
• Cooked-meal canteens bypass the household assumption, feeding the individual where they are.
• Rising rents and food prices squeeze the urban poor harder than headline poverty data suggest.
• A cheap, reliable meal frees scarce income for rent, health, and children’s schooling.

A lineage of subsidised-meal schemes

Atal Canteen joins a recognisable family of state-run community kitchens built over the past decade.

• Tamil Nadu’s Amma Unavagam (2013) pioneered the low-cost municipal canteen model in India.
• Karnataka’s Indira Canteen (2017) scaled the idea across Bengaluru and beyond.
• Rajasthan ran the Annapurna Rasoi, and several states experimented with similar kitchens.
• Each shares a common logic: dignified, no-stigma, pay-what-you-can-afford meals delivered through local bodies.

The constitutional anchor — right to food

Affordable food is not a discretionary handout; courts and the Constitution treat it as part of the right to life.

• The Supreme Court read the right to food into Article 21 in the long-running PUCL v. Union of India right-to-food litigation.
• Article 47 (DPSP) directs the state to raise the level of nutrition and standard of living.
• Article 39(a) directs that citizens have the right to an adequate means of livelihood.
• The National Food Security Act, 2013 converted much of this into a statutory entitlement; canteens extend it to those PDS misses.

Concerns and design questions

Community-kitchen schemes face recurring questions on quality, cost, and durability.

• Maintaining food quality and hygiene at a Rs 5 price point as volumes scale.
• Fiscal sustainability — recurring subsidy costs can outlast the political cycle that launched them.
• Risk of schemes shrinking or closing after a change of government, as seen with some predecessors.
• Ensuring genuine reach to the homeless and migrants, not just nearby residents who can already cook.

Way Forward

Build for permanence

• Tie funding to a stable line in the state budget rather than ad-hoc allocations.
• Embed clear hygiene and nutrition standards with regular independent audits.

Reach the truly excluded

• Site canteens deliberately near migrant labour hubs, shelters, and transit points.
• Avoid burdensome documentation so the homeless and undocumented migrants are not screened out.

Link the canteens to existing schemes — PDS, shelters, and skilling — so a cheap meal becomes an entry point to wider welfare rather than a stand-alone freebie.

Conclusion

The Atal Canteen scheme reframes a hot meal as a basic urban entitlement, extending the right-to-food idea to people the ration system was never built to reach.

Its lasting value will depend less on the Rs 5 headline than on quality, fiscal staying power, and whether it genuinely reaches the city’s most invisible workers.

UPSC Practice Questions

Prelims MCQ 1

With reference to the Atal Canteen scheme launched in December 2025, consider the following statements:

1. It was launched by the Delhi government to provide subsidised cooked meals.
2. It is implemented through the Delhi Urban Shelter Improvement Board (DUSIB).
3. It is a Union government scheme administered by the Ministry of Consumer Affairs.

How many of the above statements are correct?

(a) Only one (b) Only two (c) All three (d) None

Answer: (b) Only two

Explanation:

Statements 1 and 2 are correct. The scheme is a Delhi government initiative run by DUSIB, not a Union scheme, so statement 3 is wrong.

Prelims MCQ 2

The constitutional and legal basis for affordable food entitlements in India is best reflected in which of the following?

(a) Article 21 read with Article 47 and the National Food Security Act, 2013 (b) Article 19 and the Essential Commodities Act, 1955 only (c) Article 32 and the Right to Education Act, 2009 (d) Article 14 and the Competition Act, 2002

Answer: (a) Article 21 read with Article 47 and the National Food Security Act, 2013

Explanation:

The right to food was read into the right to life (Article 21), is supported by DPSP Article 47, and was given statutory shape by the National Food Security Act, 2013.

UPSC Mains Questions

1. Grain-based food security schemes are poorly suited to the realities of urban poverty. In this light, evaluate the role of state-run subsidised-meal canteens such as the Atal Canteen scheme in advancing the right to food.
2. “A welfare scheme is only as good as its durability and reach.” Discuss the challenges of sustainability, quality, and targeting that confront community-kitchen programmes in Indian cities, suggesting measures to address them.

Sources: NewsOnAir, Prasar Bharati and Wikipedia.

Frequently Asked Questions