U.S. announces unilateral nuclear testing moratorium.

IAEA Action Team together with UNSCOM inspectors find evidence of secret Iraqi nuclear weapons program in violation of Iraq's obligations under NPT.

New leadership in Romania exposes earlier clandestine plutonium separation and reiterates commitment to NPT.

North Korea permits IAEA inspections under NPT, following a five-year delay. IAEA inspectors detect undeclared production of plutonium and seek further special inspections to determine the scale of undeclared nuclear activities, which North Korea refuses.

China joins NPT as nuclear weapon state (NWS); France joins NPT (as NWS); Russia, as successor to USSR, joins NPT (as NWS).

Mongolia announces its single-state nuclear-weapon-free status.