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  Timeline of the Nuclear Age 1990s  1990

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New documentation shows that A.Q. Khan offered to provide significant nuclear assistance to Iraq this year. 

Nelson Mandela is released from prison. 

South Africa begins the deconstruction of its six nuclear weapons. 

The United States demands a study into Israel's assistance of South Africa in obtaining a nuclear weapon. 

President George Bush and President Mikhail S. Gorbachev sign new protocols to the Threshold Test Ban Treaty and Underground Nuclear Explosions for Peaceful Purposes Treaty, which provide for advance notification and on-site inspection of tests above 35 kilotons.

Brazilian President Fernando Collor de Mello symbolically closes a nuclear test site.

The U.S. ratifies the Threshold Test Ban Treaty. The Treaty prohibits underground nuclear weapon tests with a yield exceeding 150 kilotons (more than 10 times the yield of the Hiroshima bomb). [see July 3, 1975]

The last Pershing II missiles leave West Germany.

Brazilian President Fernando Collor de Mello formally exposes Brazilís atomic weapons plan.

The Stockholm Declaration on Preventing Accidental Nuclear War is released.

Argentine President Carlos Saul Menem and Brazilian President Fernando Collor de Mello sign the Declaration on the Common Nuclear Policy at Foz de Iguazu, Brazil. The Declaration formally renounces nuclear weapons and establishes a framework for the implementation of a bilateral nuclear accounting and inspection arrangement with full IAEA safeguards.

The United Nations General Assembly adopts the Establishment of a Nuclear-Weapons-Free Zone in the Middle East resolution.

The Threshold Test Ban Treaty enters into force.

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