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START (Strategic Arms Reduction Treaty) was a bilateral treaty between the United States of America and the Union of Soviet Socialist Republics (USSR) on the reduction and limitation of strategic offensive arms. The treaty was signed on 31 July 1991 and entered into force on 5 December 1994.〔(【引用サイトリンク】 Strategic Arms Reduction Treaty (START I): Executive Summary )〕 The treaty barred its signatories from deploying more than 6,000 nuclear warheads atop a total of 1,600 inter-continental ballistic missiles (ICBMs) and bombers. 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 percent of all strategic nuclear weapons then in existence. Proposed by United States President Ronald Reagan, it was renamed START I after negotiations began on the second START treaty. The START I treaty expired 5 December 2009. On 8 April 2010, the replacement New START treaty was signed in Prague by U.S. President Obama and Russian President Medvedev. Following ratification by the U.S. Senate and the Federal Assembly of Russia, it went into force on 26 January 2011. ==Proposal== The START proposal was first announced by United States President Ronald Reagan in a commencement address at his alma mater, Eureka College on 9 May 1982,〔(Eureka College Commencement Speech, 1982 )〕 and presented by President Ronald Reagan in Geneva on 29 June 1982. Reagan proposed a dramatic reduction in strategic forces in two phases, which he referred to as SALT III at the time.〔(Time to START, Says Reagan )〕 The first phase would reduce overall warhead counts on any missile type to 5,000, with an additional limit of 2,500 on ICBMs. Additionally, a total of 850 ICBMs would be allowed, with a limit of 110 "heavy throw" missiles like the SS-18, with additional limits on the total "throw weight" of the missiles as well. The second phase introduced similar limits on heavy bombers and their warheads, and other strategic systems as well. At the time the US had a commanding lead in strategic bombers. The US B-52 force, while aged, was a credible strategic threat but was only equipped with AGM-86 cruise missiles, beginning in 1982, because of Soviet air defense improvements in early 1980s. The US also had begun to introduce new B-1B Lancer quasi-stealth bomber and was secretly developing the Advanced Technology Bomber (ATB) project that would eventually result in the B-2 Spirit stealth bomber. The USSR's force was of little threat to the US, on the other hand, as it was tasked almost entirely with attacking US convoys in the Atlantic and land targets on the Eurasian landmass. Although the USSR had 1,200 medium and heavy bombers, only 150 of them (Tupolev Tu-95s and Myasishchev M-4s) could reach North America (the latter only with in-flight refueling). They also faced difficult problems in penetrating admittedly smaller and less heavily defended US airspace. Possessing too few bombers available when compared to US bomber numbers was evened out by the US forces having to penetrate the much larger and heavier defended Soviet airspace. This changed when new Tu-95MS and Tu-160 bombers appeared in 1984 equipped with the first Soviet AS-15 cruise missiles. By limiting the phase-in as it was proposed, the US would be left with a strategic advantage, for a time. As ''Time'' magazine put it at the time, "Under Reagan's ceilings, the U.S. would have to make considerably less of an adjustment in its strategic forces than would the Soviet Union. That feature of the proposal will almost certainly prompt the Soviets to charge that it is unfair and one-sided. No doubt some American arms-control advocates will agree, accusing the Administration of making the Kremlin an offer it cannot possibly accept—a deceptively equal-looking, deliberately nonnegotiable proposal that is part of what some suspect is the hardliners' secret agenda of sabotaging disarmament so that the U.S. can get on with the business of rearmament." However, ''Time'' did point out that, "The Soviets' monstrous ICBMs have given them a nearly 3-to-1 advantage over the U.S. in "throw weight"—the cumulative power to "throw" megatons of death and destruction at the other nation." 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「START I」の詳細全文を読む スポンサード リンク
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