START I (Strategic Arms Reduction Treaty) was a bilateral treaty between the United States and the Soviet Union on the reduction and the limitation of strategic offensive arms. The treaty was signed on 31 July 1991 and entered into force on 5 December 1994.[1] The treaty barred its signatories from deploying more than 6,000 nuclear warheads and a total of 1,600 intercontinental ballistic missiles (ICBMs) and bombers.

Strategic Arms Reduction Treaty
Договор о сокращении стратегических наступательных вооружений
Presidents George H. W. Bush and Mikhail Gorbachev sign START, 31 July 1991
TypeStrategic nuclear disarmament
Drafted29 June 1982  June 1991
Signed31 July 1991
LocationMoscow, Soviet Union
Effective5 December 1994
ConditionRatification of both parties
Expiration5 December 2009
LanguagesRussian, English

START negotiated the largest and most complex arms control treaty in history, and its final implementation in late 2001 resulted in the removal of about 80% of all strategic nuclear weapons then in existence. Proposed by US President Ronald Reagan, it was renamed START I after negotiations began on START II.

The treaty expired on 5 December 2009.

On 8 April 2010, the replacement New START Treaty was signed in Prague by US President Barack Obama and Russian President Dmitry Medvedev. Following its ratification by the US Senate and the Federal Assembly of Russia, the treaty went into force on 26 January 2011, extending deep reductions of American and Soviet or Russian strategic nuclear weapons through February 2026.[2][3]

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