On this day: The Partial Nuclear Test Ban Treaty was signed in Moscow

On Aug. 5, in 1963 the Partial Test Ban Treaty (PTBT) - the abbreviated name of the 1963 Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Underwater - was signed.

 It was the result of the Genova negotiations initiated by the Soviet Union in 1958.

The PTBT was signed by the governments of the Soviet Union, U.S., and Great Britain. The treaty came into effect on Oct. 10, 1963, becoming the first international treaty that restricted the creation and testing of nuclear weapons.

Read more: Why did the Soviet Union develop its own atomic bomb?

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