Comprehensive Nuclear Test Ban Treaty

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Event.png Comprehensive Nuclear Test Ban Treaty  Rdf-icon.png
CTBT Participation.svg.png
Participation in the CTBT
LocationNew York City

The Comprehensive Nuclear Test Ban Treaty (CTBT) is a multilateral treaty that bans all nuclear explosions, for both civilian and military purposes, in all environments. It was adopted by the United Nations General Assembly on 10 September 1996 but has not entered into force as eight specific states have not ratified the treaty.[1]


The CTBT was adopted by the UN General Assembly on 10 September 1996. It opened for signature in New York on 24 September 1996,[2] when it was signed by 71 States, including five of the eight then nuclear-capable states. As of October 2016, 166 states have ratified the CTBT and another 17 states have signed but not ratified it.[3][4]

The CTBT will enter into force 180 days after the 44 states listed in Annex 2 of the treaty have ratified it. These "Annex 2 states" are states that participated in the CTBT’s negotiations between 1994 and 1996 and possessed nuclear power reactors or research reactors at that time.[5]

Laggard states

Eight Annex 2 states have not ratified the CTBT:


  1. "Comprehensive Test Ban Treaty Chronology"
  2. United Nations Treaty Collection (2009). "Comprehensive Nuclear-Test-Ban Treaty", Retrieved 23 August 2009.
  3. "Status of Signature and Ratification". Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organisation. 2011. Retrieved 20 September 2011.

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  4. David E. Hoffman (1 November 2011), "Supercomputers offer tools for nuclear testing — and solving nuclear mysteries", The Washington Post; National, retrieved 30 November 2013

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    In this news article, the number of states ratifying was reported as 154.
  5. "The Russian Federation's support for the Comprehensive Nuclear-Test-Ban Treaty". CTBTO Preparatory Commission. 2008. Archived from the original on 27 September 2011. Retrieved 4 December 2011.

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  6. "STATE DEPARTMENT TELEGRAM 012545 TO INTSUM COLLECTIVE, "INTSUM: INDIA: NUCLEAR TEST UNLIKELY"". Nuclear Proliferation International History Project.

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