FAQs

When will the Comprehensive Nuclear-Test-Ban Treaty enter into force?

The CTBT will enter into force 180 days (i.e. six months) after all 44 Annex 2 States have deposited their instruments of ratification with the United Nations Secretary-General who is the Depositary of the Treaty. These “Annex 2” States were compiled from the IAEA’s April 1996 edition of “Nuclear Power Reactors in the World”, which identified countries that possessed nuclear research and/or power reactors at that time. These countries had also participated in the Conference on Disarmament and in CTBT negotiations in 1996.

To see the current status of which Annex II States have ratified the Treaty, click here.

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