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President Richard Nixon and General Secretary Leonid Brezhnev sign Threshold Test Ban Treaty (TTBT),

1974

President Richard Nixon and General Secretary Leonid Brezhnev sign Threshold Test Ban Treaty (TTBT),

limiting yields of underground nuclear tests to 150 kilotons. Followed in 1976 by the signing the Peaceful Nuclear Explosion Treaty (PNET) by President Gerald Ford and General Secretary Brezhnev.