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START II (Strategic Arms Reduction Treaty) was a bilateral treaty between the United States of America and Russia on the Reduction and Limitation of Strategic Offensive Arms. It was signed by United States President George H. W. Bush and Russian President Boris Yeltsin on 3 January 1993, banning the use of multiple independently targetable reentry vehicles (MIRVs) on intercontinental ballistic missiles (ICBMs). Hence, it is often cited as the De-MIRV-ing Agreement. It never entered into effect. It was ratified by the U.S. Senate on 26 January 1996 with a vote of 87-4. Russia ratified START II on 14 April 2000, but on 14 June 2002, withdrew from the treaty in response to U.S. withdrawal from the ABM Treaty. Instead, SORT came into effect, reducing strategic warheads count per country to 1,700 - 2,200. ==Impact of MIRV== MIRVed land-based ICBMs are considered destabilizing because they tend to put a premium on striking first. A MIRV missile is able to carry 3-12 warheads and deliver them to separate targets. Thereby, if it is used in a first strike, it possibly destroys many of the enemy's missile sites. Hypothetically, if one were to assume that each side had 100 missiles, with 5 warheads each, and further that each side had a 95 percent chance of neutralizing the opponent's missiles in their silos by firing 2 warheads at each silo, then the side that strikes first can reduce the enemy ICBM force from 100 missiles to about 5 by firing 40 missiles with 200 warheads and keeping the remaining 60 missiles in reserve. Thus the destruction capability is greatly multiplied by MIRV, when the number of enemy silos does not significantly increase. Both Soviet R-36M and the US LGM-118 Peacekeeper missiles were capable of carrying up to 10 MIRVs (the latter not currently operational). 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 II」の詳細全文を読む スポンサード リンク
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