The vast majority of states already reject nuclear weapons. As of 1 October 2019, 157 states – four-fifths of the world’s 197 states – have excluded any role for nuclear weapons in their military postures. On the basis of their basic nuclear-weapons policies, the Ban Monitor divides these states into the following categories:
TPNW supporters - States with nuclear-free security strategies that have signed, ratified, acceded to/or voted in favour of the TPNW in the UN.
Other non-nuclear-armed states - States that also maintain non-nuclear security policies but that have not yet adhered to or voted in favour of the TPNW in the UN.
Nuclear-weapon-complicit states - States that do not possess nuclear weapons but have outsourced their nuclear postures to one or more nuclear-armed allies through arrangements of extended nuclear deterrence.
Nuclear-armed states - The states that have nuclear arsenals.
The world’s 197 states by nuclear-weapon policy
TPNW supporters are states with nuclear-free security strategies that have signed, ratified, acceded to, and/or that vote in favour of the TPNW in the UN.
OTHER NON-NUCLEAR-ARMED STATES
The states categorized by the Ban Monitor as “other nuclear-armed states” maintain non-nuclear security policies but have not yet adhered to the TPNW and do not vote in favour of the Treaty in the UN. Some of them are opposed to the TPNW, whilst others are undecided.
Nuclear-weapon-complicit states are states that that do not possess nuclear weapons but have outsourced their nuclear postures to one or more nuclear-armed allies through arrangements of extended nuclear deterrence (sometimes called a nuclear “umbrella”). They have officially endorsed or acquiesced in the retention and potential use of nuclear weapons on their behalf. They assist, encourage, or induce nuclear armament and thus function as enablers that share responsibility for the perpetuation of nuclear risks.
Note, however, that not all military alliances that include a nuclear-armed state are automatically an arrangement of extended nuclear deterrence or nuclear “umbrella”. For example, Kazakhstan, Kyrgyzstan, the Philippines, Tajikistan, and Thailand all maintain military alliances with either Russia or the United States but have through national statements, or signature and ratification of international agreements signaled that they do not support the use of nuclear weapons under any circumstances.
The nuclear-armed states are the nine states that have nuclear arsenals.