From over 2,000 tests to fewer than a dozen.




Before the Comprehensive Nuclear-Test-ban Treaty (CTBT) was opened for signature, more than 2,000 nuclear test explosions had been conducted worldwide. Since 1996, that number has fallen to fewer than a dozen. This dramatic decline is no accident. It reflects the strength of the norm created by our Treaty and the value that the international community places on preventing any return to testing.

The Treaty is already a proven success. It has brought almost all nuclear testing to an end, placing powerful constraints on the development of new nuclear weapons and the advancement of existing designs, while fostering a strong international expectation that testing belongs in the past. Entry into force will build upon this, giving us the full range of verification measures, including on-site inspections, to further reinforce what has already been achieved.



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