The U.S.S.R. conducts its first nuclear weapons test after a 19-month moratorium period, during which it attempted to renew U.S. interest in test ban negotiations. The Reagan administration was not responsive. September 23, 1992. The U.S. conducts its last nuclear explosion test and joins France and Russia in moratoriums. October 4, 1993.
China breaks a year-long, de facto global moratorium on testing.
December 16, 1993. The United Nations General Assembly adopts a resolution calling for negotiations on a comprehensive test ban. The U.N. Conference on Disarmament in Geneva formally begins negotiations on a treaty. May 11, 1995. The Non-Proliferation Treaty is extended indefinitely, in large part due to the agreement that a comprehensive test ban treaty would be ready for signature before the end of 1996.