May 11, 1995: More than 170 countries agree to the indefinite extension of the Nuclear Non-Proliferation Treaty

Introduced for signature July 1, 1968, the Nuclear Non-Proliferation Treaty aims to stop the spread of nuclear weapons, promote the peaceful and cooperative use of new and existing nuclear technology and energy and express the desire of participants to achieve general nuclear-weapon disarmament. Sixty-two countries signed the treaty that day, and 189 have signed to date, five of which are nuclear-weapon countries: China, France, Russia, the U.K. and the U.S. More than 170 countries agreed on May 11, 1995, to continue the treaty indefinitely and without conditions.

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