The Nuclear Non-Proliferation Treaty (NPT) was made permanent in May, 25 years after it entered into force. The four-week NPT Review and Extension Conference (held in New York April 17 to May 12) was the largest arms control conference ever held, with 175 of the treaty's 178 parties participating. No state got all it wanted, although the weapon states had more reason to be satisfied than the non-weapon states.
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