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The Cuban crisis began on October 16, 1962, when National Security Adviser McGeorge Bundy presented to Kennedy photographs showing that the Soviet Union, then led by Nikita Khrushchev, had placed on the island – just 90 miles (145 kilometers) from Florida – ballistic missiles capable of launching nuclear weapons at major US cities.Suddenly, the world was on the precipice of a nuclear exchange that could lead to global annihilation.