Iraq defeated in Persian Gulf War; under UN Security Council Resolution 687, UN Special Commission (UNSCOM) inspections begin.
The U.S. and Soviet Union sign the START I Treaty. U.S. and USSR declare unilateral cuts in tactical nuclear weapons. USSR collapses in December.
Republic of South Africa joins NPT as a non-nuclear weapon state after dismantling its arsenal of nuclear warheads.
Argentina and Brazil formally renounce nuclear weapons and agree to mutual inspections under the Argentine-Brazil Agency for
Accounting and Control (ABACC).
U.K. conducts its last nuclear test.