The Treaty on the Prohibition of Nuclear Weapons prohibits the use, threat of use, development, production, manufacturing, acquisition, possession, stockpiling, transfer, stationing and installment of nuclear weapons or assistance with any prohibited activities. It requires states-parties to declare if they once had or currently have nuclear weapons and if there are nuclear weapons on their territory. It requires states-parties that currently have nuclear weapons to destroy them and those that have nuclear weapons on their territory to remove them. States-parties must also provide victim assistance to those impacted by nuclear weapon use and testing and environmental remediation assistance to areas impacted by nuclear weapon use and testing.

As of January 25, 2024, 93 states have signed the treaty and 70 have ratified it.

Opened for Signature: September 20, 2017

Entry into Force: January 22, 2021

Official Text: http://disarmament.un.org/treaties/t/tpnw/text

Status and Signatories: http://disarmament.un.org/treaties/t/tpnw

ACA Backgrounder: https://www.armscontrol.org/factsheets/nuclearprohibition