Trilateral agreement negotiated by the US, USSR, and UK prohibiting tests of nuclear devices in the atmosphere, in outer space, and underwater. Allows nuclear testing to continue underground, so long as radioactive debris is not allowed “outside the territorial limits” of the testing state. The treaty has since been signed by a total of 116 countries, including potential nuclear states Argentina, Brazil, India, Israel, Pakistan, and South Africa. Though two major nuclear powers, France and the People’s Republic of China, have not signed, they are now abiding by its provisions. In 1992, China exploded a bomb beyond the LTBT limits.
