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– Hans Blix,
former IAEA Director-General

Strategic Arms Reduction Treaty I (START I)
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The Strategic Arms Reduction Treaty I (START I) was the first treaty that required U.S. and Soviet/Russian reductions of strategic nuclear weapons. It was indispensable in creating a framework that ensured predictability and stability for deep reductions. The dissolution of the Soviet Union caused a delay in the entry into force of the treaty, as the classification of states as nuclear or non-nuclear had to be determined, among other things. Reductions of nuclear weapons had to be completed within seven years after entry into force and maintained for another eight years. States were verified by on-site inspections. Both the United States and The Russian Federation continued reduction efforts. A new treaty, START II, soon came into effect, which allowed START I to expire.

Opened for Signature: 31 July 1991

Entry into force: 5 December 1994

Official Text: http://fas.org/nuke/control/start1/text/

Status and Signatories: http://fas.org/nuke/control/start1/

Posted: July 31, 1991