Republic of Korea

Nuclear-weapon endorser

Did not participate in TPNW negotiations

Has not yet joined TPNW

South Korea supports the retention and potential use of US nuclear weapons on its behalf, as indicated in various policy statements and rooted in the 1953 Mutual Defense Treaty

South Korea has not yet signed or ratified the Treaty on the Prohibition of Nuclear Weapons.South Korea did not participate in the negotiation of the treaty at the United Nations in New York in 2017 and thus did not vote on its adoption.

In June 2017, a week before the adoption of the treaty, the US president, Donald Trump, and South Korean president, Moon Jae-in, issued a joint statement in which the United States reiterated its “commitment to provide extended deterrence to [South Korea], drawing on the full range of US military capabilities, both conventional and nuclear”.

South Korea voted against a UN General Assembly resolution in 2019 that welcomed the adoption of the treaty and called upon “all states that have not yet done so to sign, ratify, accept, approve, or accede to the treaty at the earliest possible date”.

On the opening day of the TPNW negotiating conference in 2017, South Korea joined the United States and several other states in protesting the treaty-making process.

In 2016, South Korea voted against the UN General Assembly resolution that established the formal mandate for states to commence the negotiations in 2017 on “a legally binding instrument to prohibit nuclear weapons, leading towards their total elimination”.

Find a local ICAN partner to get active Become an ICAN Partner Organization ›

  • Korean Physicians for Peace


  • Peace Network and Civil Peace Forum


  • People’s Solidarity for Participatory Democracy


  • Solidarity for Peace and Reunification of Korea (SPARK)


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There are currently no elected representatives or local or regional bodies in this country committed to supporting the TPNW through the ICAN Cities Appeal or ICAN Parliamentary Pledge. Find out what you can do to support the TPNW in this country.