Nuclear Non-Proliferation Treaty

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) was opened for signature on 1 July 1968 and entered into force on 5 March 1970. It rests on three interlocking "pillars": non-proliferation, disarmament, and the peaceful use of nuclear energy. The treaty draws a legal distinction between Nuclear-Weapon States (NWS) — defined under Article IX(3) as those that manufactured and exploded a nuclear device before 1 January 1967, namely the United States, the Soviet Union (now Russia), the United Kingdom, France, and China (the P5 of the UN Security Council) — and Non-Nuclear-Weapon States (NNWS). Article I prohibits NWS from transferring weapons or assisting NNWS in acquiring them; Article II binds NNWS not to receive or manufacture them; Article III requires NNWS to accept International Atomic Energy Agency (IAEA) safeguards under comprehensive safeguards agreements. With 191 parties, it is the most widely adhered-to arms-control instrument in history.

Article IV affirms the "inalienable right" of all parties to develop nuclear energy for peaceful purposes, the bargain that induced NNWS to forgo weapons. Article VI obliges all parties — pointedly the NWS — to pursue negotiations in good faith on effective measures relating to cessation of the arms race and nuclear disarmament, an obligation affirmed as binding by the International Court of Justice in its 1996 Legality of the Threat or Use of Nuclear Weapons advisory opinion. Article X permits withdrawal on three months' notice if extraordinary events jeopardise supreme national interests, and provides for periodic review. Under Article X(2), the 1995 Review and Extension Conference extended the treaty indefinitely, packaged with a Resolution on the Middle East and Principles and Objectives for Non-Proliferation and Disarmament. Compliance is reviewed every five years at Review Conferences (RevCons).

Four states have never joined: India, Pakistan, Israel, and South Sudan; North Korea announced withdrawal in 2003. India characterises the NPT as discriminatory for entrenching a nuclear monopoly and instead advocates universal, non-discriminatory disarmament, while securing the 2008 IAEA-approved India-specific safeguards and the Nuclear Suppliers Group waiver enabling the Indo-US civil nuclear deal. Iran's enrichment programme prompted the 2015 Joint Comprehensive Plan of Action (JCPOA), from which the US withdrew in 2018. The 2017 Treaty on the Prohibition of Nuclear Weapons (TPNW), in force 2021, reflects NNWS frustration with stalled Article VI progress; the NWS boycott it. The 2026 status remains one of persistent strain over disarmament inaction, the Russia-Ukraine war's nuclear rhetoric, and Iran's contested programme.

For the examination, the NPT is core to UPSC GS Paper II (international relations, global groupings) and Paper I world history, and to FSOT, CSS, BCS and Guokao international-affairs sections. Typical question angles: explain why India remains a non-signatory and reconcile this with the 2008 NSG waiver; distinguish the three pillars and the NWS/NNWS divide; assess the credibility of Article VI; and compare the NPT with the CTBT, FMCT, and TPNW. Candidates should memorise the 1968/1970 dates, the 1967 cut-off defining NWS, the indefinite 1995 extension, and the IAEA's safeguards role under Article III.