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Treaty on the Prohibition of Nuclear Weapons (TPNW)

Entry Into Force

As 2019 came to a close, there was an increase in momentum for the TPNW to become international law. Antigua & Barbuda became the 81st nation to sign (or accede to) the Treaty, while Nauru became the 34th nation to complete the ratification process. Several other countries are on the brink of signing and ratifying the Treaty. We only need 16 more ratifications for it to enter into force, thereby creating a powerful new international moral and legal prohibition against the use and threat of use of nuclear weapons. We are optimistic that, through the continued hard work of IPPNW and ICAN members from around the world, 2020 will be the year the TPNW becomes international law. IPPNW staff and affiliates are actively educating delegates at the United Nations and meeting and writing foreign ministers and other government officials to secure further signatures and ratifications.


Learn about Nuclear Weapons

Learn About Nuclear Weapons is a web-based educational material from the Swedish Physicians Against Nuclear Weapons for those who want to learn more about nuclear weapons: