Treaty on the Prohibition of Nuclear Weapons

Treaty on the Prohibition of Nuclear Weapons
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Name	Treaty on the Prohibition of Nuclear Weapons
Date signed	7 July 2017
Location signed	United Nations, New York City
Date effective	22 January 2021
Condition effective	50 ratifications
Signatories	86 (as of 2021)
Parties	66 (as of 2021)

Treaty on the Prohibition of Nuclear Weapons is a multilateral treaty adopted in 2017 that prohibits the development, testing, production, acquisition, possession, stockpiling, transfer, and use of nuclear weapons and related assistance. Negotiated under the auspices of the United Nations and spearheaded by the International Campaign to Abolish Nuclear Weapons, the treaty reflects initiatives by states and civil society actors including members of the Non-Aligned Movement, Pacific Islands Forum, and delegations from Austria, Mexico, and South Africa.

Background and negotiation

Negotiations arose from earlier instruments such as the Treaty on the Non-Proliferation of Nuclear Weapons, the Comprehensive Nuclear-Test-Ban Treaty, and regional agreements like the Treaty of Tlatelolco, the Treaty of Rarotonga, and the African Nuclear-Weapon-Free Zone Treaty. Influential moments included the humanitarian-focused conferences in Oslo, Nayarit, and Vienna and campaigns by NGOs linked to Physicians for Social Responsibility, International Physicians for the Prevention of Nuclear War, and the Mayors for Peace network. States including Brazil, Ireland, Indonesia, Thailand, and Nigeria backed negotiation efforts, while nuclear-armed states such as United States, Russia, China, France, and United Kingdom remained outside talks. The negotiating conference in New York City culminated on 7 July 2017 with adoption by a vote involving delegations from Japan, Canada, Australia, and members of the European Union voting variously for, against, or abstaining.

Key provisions and obligations

The treaty obliges parties to prohibit a range of activities: development, testing, production, manufacturing, acquisition, possession, stockpiling, deployment, and use of nuclear weapons, as well as provision of assistance and encouragement to such activities. It mandates destruction of existing nuclear warheads and related facilities under national implementation measures, and requires victim assistance and environmental remediation drawing on precedents from instruments like the Ottawa Treaty and the Convention on Cluster Munitions. The instrument establishes provisions for international cooperation, victim assistance, environmental remediation, and institutional arrangements that relate to entities such as the International Committee of the Red Cross and the International Atomic Energy Agency for technical engagement without creating a parallel verification regime.

Signatories, ratifications, and entry into force

Initial signatories included states from the Caribbean Community, the Organisation of Islamic Cooperation, and the Pacific Islands Forum, with early ratifications by Jamaica, Saint Vincent and the Grenadines, Nauru, Malta, and Vanuatu. The treaty entered into force on 22 January 2021 after the fiftieth instrument of ratification was deposited, a threshold similar to activation provisions in the Chemical Weapons Convention and the Biological Weapons Convention. Several regional organizations, including the African Union and the Association of Southeast Asian Nations, have debated positions; some members of the European Union adopted supportive stances while others aligned with NATO policies.

Implementation, verification, and compliance

Implementation challenges echo verification issues seen in the Strategic Arms Reduction Treaty and the Intermediate-Range Nuclear Forces Treaty. The treaty foresees national implementation measures, reporting obligations to a meeting of states parties, and cooperation with international organizations such as the International Atomic Energy Agency for technical assistance. Unlike the Comprehensive Nuclear-Test-Ban Treaty with its International Monitoring System, the instrument does not create an independent verification authority; instead, it anticipates cooperative verification arrangements and confidence-building mechanisms reminiscent of verification practices used in START I and New START.

International response and legal status

Reaction varied across diplomatic communities: disarmament advocates in Canada, Ireland, New Zealand, and South Africa hailed the treaty, while nuclear-armed states and allies in Japan, Germany, Turkey, and South Korea criticized its approach. Military alliances including NATO, bilateral frameworks such as the US–UK Special Relationship, and nuclear doctrines articulated at the Nuclear Security Summit influenced reservations. Questions about the treaty’s status vis-à-vis customary international law and its relationship with the Treaty on the Non-Proliferation of Nuclear Weapons prompted legal analyses by scholars at institutions like the London School of Economics, Harvard Law School, University of Tokyo, and the Hague Academy of International Law.

Impact on nuclear disarmament efforts

The treaty invigorated campaigns by organizations such as ICAN, reshaped debates in forums including the United Nations General Assembly and the Conference on Disarmament, and influenced parliamentary deliberations in legislatures like the Parliament of the United Kingdom, the Congress of the United States, and the Knesset. Regional non-proliferation efforts in the Middle East and initiatives like the Proliferation Security Initiative experienced renewed scrutiny, while arms control dialogues between United States and Russia along with trilateral exchanges among France, United Kingdom, and China continued in parallel. The treaty has been cited in litigation and advisory opinions considered by national courts and international bodies including the International Court of Justice.

Criticism and controversies

Critics argue the treaty may undermine established frameworks such as the Nuclear Non-Proliferation Treaty and complicate arms control talks exemplified by START processes; nuclear-armed states including India, Pakistan, Israel, and North Korea rejected the treaty. Military strategists in NATO and analysts at think tanks like the Carnegie Endowment for International Peace, RAND Corporation, and International Institute for Strategic Studies raised concerns about security guarantees and extended deterrence arrangements. Debates continue over verification, the fate of nuclear materials managed by agencies such as the International Atomic Energy Agency, and the treaty’s interaction with customary norms assessed by jurists at the International Law Commission and legal scholars across universities such as Yale, Stanford, and Oxford.

Category:Nuclear disarmament treaties