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Nuclear triad
Set of three types of nuclear-strike weapons / From Wikipedia, the free encyclopedia
A nuclear triad is a three-pronged military force structure of land-based intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and strategic bombers with nuclear bombs and missiles.[1] Countries build nuclear triads to eliminate an enemy's ability to destroy a nation's nuclear forces in a first-strike attack, which preserves their own ability to launch a second strike and therefore increases their nuclear deterrence.[2][3][4]
Only four countries are known to have the nuclear triad: the United States, Russia, India, and China.[5][6] Pakistan is a "Partial Nuclear Triad". Israel is suspected to possess a nuclear triad, but its status is not confirmed.