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  • May 15, 1957 - The United Kingdom tests its first thermonuclear weapon at the Christmas Islands in the Pacific.
  • May 18, 1974 - India conducts an underground nuclear test at Pokharan in the Rajasthen desert, codenamed the "Smiling Buddha." The government claims it is a peaceful test, but it is actually part of an accelerated weapons program.
  • May 24, 2002 - United States President George W. Bush and Russian President Vladimir Putin sign the Strategic Offensive Reduction Treaty (SORT) and a Joint Statement, agreeing to reduce operationally deployed offensive strategic nuclear weapons to between 1,700 and 2,200 by 2012.
  • May 26, 1972 - The first round of Strategic Arms Limitation Talks (SALT I ) ends with President Richard M. Nixon and General Secretary Leonid Brezhnev signing the Anti-Ballistic Missile (ABM) Treaty, the SALT Accord, and the Interim Agreement on Strategic Offensive Arms.
 
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