Partial Nuclear Test Ban Treaty is Signed.
Also known as the Nuclear Test Ban Treaty, the document was signed by the Soviet Union, the United Kingdom, and the United States in Moscow. The treaty, which came as a response to the heightening tensions due to the frequent testing of nuclear weapons by the these 3 countries during the Cold War, banned the testing of nuclear weapons anywhere on land, over water or in space. Underground testing was still allowed under the treaty, until it was also banned in 1996 after the Comprehensive Nuclear-Test-Ban Treaty came into force.