India's Nuclear Doctrine

India's nuclear doctrine is the official set of rules on why India keeps nuclear weapons and when it would use them. Its heart is two ideas. No First Use (NFU) means India will never be the first to use a nuclear weapon; it will use one only to hit back after a nuclear attack on it. Credible Minimum Deterrence (CMD) means India keeps only as many weapons as it needs to make any enemy believe that attacking India would be suicidal.

Why does India have a doctrine?

A country with nuclear weapons must tell the world, and its own forces, how it thinks about them. Without clear rules, a crisis can spiral because each side fears the other will strike first. A published doctrine works like a clear warning sign on a gate: it tells others exactly what will happen if they cross the line. This makes war less likely, which is the whole point of deterrence (stopping an attack by making its cost too high).

Where did it come from?

India tested a nuclear device in 1974 at Pokhran, Rajasthan, calling it a "peaceful nuclear explosion". It declared itself a nuclear weapons state after the Pokhran-II tests in May 1998 (Operation Shakti), a series of five explosions on 11 and 13 May 1998. Pakistan carried out its own tests in the Chagai Hills later that month.

After this, the National Security Advisory Board (NSAB) released a draft nuclear doctrine on 17 August 1999. The strategic thinker K. Subrahmanyam led the board that prepared it. The government adopted the official doctrine, with some changes, through the Cabinet Committee on Security (CCS) on 4 January 2003.

What does the 2003 doctrine say?

The official statement lists these main points:

1. India will build and keep a credible minimum deterrent.
2. No First Use: nuclear weapons will be used only to retaliate against a nuclear attack on Indian territory or on Indian forces anywhere.
3. Retaliation to a first strike will be "massive" and designed to cause "unacceptable damage" (damage so heavy that no enemy would think the attack was worth it).
4. Only the civilian political leadership, through the Nuclear Command Authority, can order a nuclear strike.
5. No use against non-nuclear-weapon states. India will not use nuclear weapons against countries that do not have them.
6. The one exception: if India or its forces anywhere face a major attack with biological or chemical weapons, India keeps the option of answering with nuclear weapons.
7. India will keep strict controls on exports of nuclear and missile materials and technology, take part in talks on a Fissile Material Cut-off Treaty (FMCT), and continue its moratorium (voluntary pause) on nuclear tests.
8. India remains committed to a nuclear-weapon-free world through global, verifiable and non-discriminatory disarmament.

Who controls the weapons?

The Nuclear Command Authority (NCA), set up on 4 January 2003, has two parts:

• Political Council: chaired by the Prime Minister. It is the only body that can authorise the use of nuclear weapons.
• Executive Council: chaired by the National Security Adviser (NSA). It gives inputs to the Political Council and carries out its orders.

The Strategic Forces Command (SFC), a tri-service command (drawing from the Army, Navy and Air Force), manages and would actually launch the weapons. The official statement also said there are alternate chains of command, so retaliation is possible even if the top leadership is hit.

How does deterrence work in practice?

NFU works only if the enemy believes India can survive a first strike and still hit back hard. This is called second-strike capability. For this, India built a nuclear triad, meaning it can deliver weapons from land (Agni missiles), air (fighter aircraft) and sea (submarines). The sea leg is the hardest to destroy because submarines hide underwater. India's nuclear-powered submarine INS Arihant completed its first deterrence patrol in November 2018, which the government described as completing the triad.

India's position compared with others

India and China are the best-known countries with a declared NFU policy. China announced its NFU in October 1964, right after its first nuclear test, and calls it unconditional. Pakistan has no NFU policy. It follows "full spectrum deterrence", keeping nuclear weapons at all levels, including short-range tactical nuclear weapons like the Nasr (Hatf-IX) missile first tested in April 2011.

Pakistan says this is meant to counter Indian conventional military superiority. The United States, Russia, the UK and France also keep the option of using nuclear weapons first in some situations.

Commonly confused concepts

• No First Use vs No Use: NFU means India will not strike first but will hit back. "No use against non-nuclear states" is a separate promise not to use them at all against countries without nuclear weapons. This second promise is called a negative security assurance.
• Draft doctrine (1999) vs official doctrine (2003): The 1999 text was a proposal by an advisory board. The 2003 CCS statement is the government's official position, and it added the chemical and biological weapons exception.
• Nuclear Command Authority vs Strategic Forces Command: The NCA is the civilian body that decides. The SFC is the military command that carries out the decision.
• Credible Minimum Deterrence vs arms race: "Minimum" means India does not try to match other countries weapon for weapon; it keeps only what is needed for a believable second strike.

Issues, criticism and the way forward

• Is NFU still right? Some experts argue NFU lets an enemy strike first and hurt India's ability to respond, and that it gives Pakistan room to carry out terror attacks under a nuclear shield. Others argue NFU makes India look responsible, lowers the risk of accidental war, and helped India win the 2008 Nuclear Suppliers Group waiver. In August 2019, the then Defence Minister said India had strictly followed NFU but its future "depends on circumstances", which revived this debate.
• "Massive" retaliation: Critics ask whether India would really launch a massive strike in answer to a small tactical nuclear weapon used on a battlefield. Supporters say the threat must stay massive to keep it believable.
• Chemical and biological exception: Some say this weakens the purity of NFU; others say it is needed because these weapons can also kill on a huge scale.
• Transparency: The doctrine has not been officially reviewed since 2003, and the members of the NCA councils have never been fully made public. Experts suggest a periodic review and a stronger, survivable sea-based leg.
• Way forward: Most strategic writers suggest keeping NFU while building a stronger second-strike force, better missile defence and clearer crisis communication with neighbours.

Concepts to Know

• Deterrence: Stopping an enemy from attacking by convincing them that the price of attacking will be far greater than anything they could gain.
• Second-strike capability: The ability to survive a nuclear attack and still launch a strong counter-attack. Without it, NFU would be a dangerous promise.
• Nuclear triad: The ability to launch nuclear weapons from land-based missiles, aircraft and submarines. Having all three makes it almost impossible for an enemy to destroy every weapon in one strike.
• Tactical nuclear weapon: A small, short-range nuclear weapon meant for use on a battlefield against troops, unlike large "strategic" weapons aimed at cities.
• Moratorium: A voluntary decision to stop doing something for a time. India has not carried out a nuclear test since 1998.
• Fissile Material Cut-off Treaty (FMCT): A proposed treaty that would ban making new fissile material (enriched uranium or plutonium) for nuclear weapons. Talks on it have not yet begun formally.
• Negative security assurance: A promise by a nuclear-armed country not to use or threaten to use nuclear weapons against countries that do not have them.