On the basis of their status, states parties will belong to one of the following four categories:
Non-nuclear-armed states (‘Article 3 states’): These are either states that have never possessed nuclear weapons (the overwhelming majority of potential states parties), or states that relinquished them before the TPNW was adopted on 7 July 2017 (i.e. current states parties South Africa and Kazakhstan, plus Belarus and Ukraine, should they decide to adhere to the Treaty).
Destroy-and-join states (‘Article 4(1) states’): States that possessed nuclear weapons when the TPNW was adopted on 7 July 2017 but which relinquish them before they become a party to the TPNW. This is the ‘destroy-and-join’ pathway for nuclear-armed states’ adherence to the TPNW. At present the nuclear-armed states are China, France, India, Israel, North Korea, Pakistan, Russia, the United Kingdom, and the United States.
Join-and-destroy states (‘Article 4(2) states’): States that still possess nuclear arms when they become party to the TPNW. This is the 'join-and-destroy’ pathway for nuclear-armed states’ adherence to the Treaty. At present, the nuclear-armed states are China, France, India, Israel, North Korea, Pakistan, Russia, the United Kingdom, and the United States.
Host states (‘Article 4(4) states’): States that, when they become party to the TPNW, have nuclear weapons on their territory or in any place under their jurisdiction or control that are owned, possessed, or controlled by another state. At present, the relevant states are Belgium, Germany, Italy, the Netherlands, and Turkey. They would be both Article 3 and Article 4(4) states should they decide to adhere to the Treaty.
Information on the respective obligations that the TPNW lays down on the states in these categories follow in the other sections in the menu.
After the submission of its declaration under Article 2, each state party’s further reporting requirements will depend on its status under the Treaty. All Article 4 states will be required to submit a report to each meeting of states parties and each review conference on the progress made towards the implementation of their obligations under that article, until such time as they are fulfilled.
To assist the states parties, the International Committee of the Red Cross has prepared model declarations, which are available in English, French, and Spanish. Since the TPNW entered into force on 22 January 2021, 21 February 2021 was the date upon which the 30-day deadline for submission of a declaration expired for the first 50 states parties. An overview of declarations received, is maintained by the UN Office for Disarmament Affairs.
In addition to the declarations required by Article 2 and reporting required by Article 4, the Nuclear Weapons Ban Monitor would encourage voluntary reporting under the TPNW on legislative and other measures taken to implement the Treaty (Article 5) and on other issues such as cooperation and assistance, victim assistance, and environmental remediation.