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Pre-emptive nuclear strike
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Pre-emptive nuclear strike : ウィキペディア英語版
Pre-emptive nuclear strike

In nuclear strategy, a first strike is a preemptive surprise attack employing overwhelming force. First strike capability is a country's ability to defeat another nuclear power by destroying its arsenal to the point where the attacking country can survive the weakened retaliation while the opposing side is left unable to continue war. The preferred methodology is to attack the opponent's strategic nuclear weapon facilities (missile silos, submarine bases, bomber airfields), command and control sites, and storage depots first. The strategy is called counterforce.
==Overview==

During the Cold War period, both superpowers, NATO and the Eastern Bloc, built massive nuclear arsenals, aimed, to a large extent, at each other. However, they were never used, as after a time, leaders on both sides of the Iron Curtain realized that global thermonuclear war would not be in either power's interest, as it would probably lead to the destruction of both sides, and possibly nuclear winter or other extinction level events. Therefore, at times, both sides refrained from deploying systems capable of unanswerable nuclear strikes against either side. However, in both nations, there were interests that benefited from the development and maintenance of first-strike weapons systems: what U.S. President Dwight Eisenhower termed the military-industrial complex; these forces encouraged the constant development of weapons systems of greater accuracy, power, and destruction. In addition, each side doubted the other side's commitment to not deploy first-strike weapons, or even in the event of their deployment, to not strike first. Some first-strike weapons were deployed; however like most nuclear weapons, they were never used.
Of the nuclear powers, only the People's Republic of China and the Republic of India have declarative, unqualified, unconditional no-first-use policies. In 1982, at a special session of the General Assembly of United Nations, the USSR pledged not to use nuclear weapons first, regardless of whether its opponents possessed nuclear weapons or not. This pledge was later abandoned by post-Soviet Russia to compensate the overwhelming conventional weapon superiority enjoyed by NATO. The United States has a partial, qualified no-first-use policy, stating that they will not use nuclear weapons against states that do not possess nuclear weapons or other weapons of mass destruction.
Large-scale missile defense systems are not first-strike weapons, but certain critics view them as first-strike enabling weapons. U.S. President Ronald Reagan's proposed Strategic Defense Initiative, if it had ever been deployed (and proven successful), would have undermined the fundamental premise of mutual assured destruction (the inevitable outcome of equal and unacceptable destruction for both sides in the event of nuclear war), removing the incentive for the US not to strike first.
These proposed defense systems, intended to lessen the risk of devastating nuclear war, would lead to it, according to these critics. Indeed, according to game theory, the side not building large-scale missile defenses would have an incentive to launch a pre-emptive first strike while such a strike could still get through.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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