A state in which the deterrent function that works on nuclear powers is exerted on non-nuclear powers. In modern times, the security of any country cannot be considered without the existence of nuclear weapons, and the threat that nuclear powers pose to non-nuclear powers is a serious problem, especially given the overwhelming destructive power of nuclear weapons and the lack of effective defenses against them. The United States has therefore extended its nuclear umbrella, promising to retaliate with its own nuclear weapons if its allies are subjected to a nuclear attack. However, there is concern that the United States will not dare to enter into nuclear war even if it is not directly related to its own vital interests. With the dissolution of the Warsaw Pact and the collapse of the Soviet Union, Russia's nuclear umbrella has been reduced. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
核保有国に働く抑止の機能を非核保有国に及ぼす状態。現代ではいかなる国の安全保障も核兵器の存在を抜きにしては考えられず,特に核兵器の圧倒的な破壊能力とそれに対する有効な防御手段がないことから,核保有国が非核保有国に及ぼす脅威は深刻な問題となる。そこでアメリカは同盟国が核攻撃にさらされれば自国の核兵器で報復することを約束して核の傘を差伸べている。しかしアメリカが自国の死活的利益に直接つながらない場合でもあえて核交戦に踏切ることができるかどうかという問題が指摘されている。ワルシャワ条約機構の解体とソ連邦の崩壊によって,ロシアの核の傘は縮小した。
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