Unofficially on November 1958 to September 1961, the three nuclear powers, the United States, the United Kingdom, and the Soviet Union held a nuclear weapons testing moratorium.
- Partial Nuclear Test Ban Treaty – Wikipedia
The Partial Test Ban Treaty (PTBT) is the abbreviated name of the 1963 Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water, which prohibited all test detonations of nuclear weapons except for those conducted underground.
- Nuclear Testing and Comprehensive Test Ban Treaty (CTBT) Timeline
It is widely understood that nuclear weapons have only been used twice in wartime and with terrible consequences. Often overlooked is the fact that they have been “used” elsewhere—through more than 2,000 nuclear test explosions by at least eight countries since 1945.