Cuban Missile Crisis

On October 14, 1962, CIA U-2 spy planes took photographs of intermediate-range ballistic missile sites being built in Cuba by the Soviets. The photos were shown to Kennedy on October 16; a consensus was reached that the missiles were offensive in nature and thus posed an immediate nuclear threat. Kennedy faced a dilemma: if the U.S. attacked the sites, it might lead to nuclear war with the U.S.S.R., but if the U.S. did nothing, it would be faced with the increased threat from close range nuclear weapons. The U.S. would as well appear to the world as less committed to the defense of the hemisphere. On a personal level, Kennedy needed to show resolve in reaction to Khrushchev, especially after the Vienna summit.
More than a third of the members of the National Security Council (NSC) favored an unannounced air assault on the missile sites, but for some of them this conjured up an image of "Pearl Harbor in reverse".There was as well some reaction from the international community (asked in confidence) that the assault plan was an overreaction in light of U.S. missiles that had been placed in Turkey by Eisenhower. And there could be no assurance that the assault would be 100% effective. In concurrence with a majority vote of the NSC, Kennedy decided on a naval quarantine. On October 22 he dispatched a message to Khrushchev and announced the decision on TV.

Meeting Nikita Khrushchev in 1961

The U.S. Navy would stop and inspect all Soviet ships arriving off Cuba, beginning October 24. The Organization of American States gave unanimous support to the removal of the missiles. The president exchanged two sets of letters with Khrushchev, to no avail. United Nations (UN) Secretary General U Thant requested both parties reverse their decisions and enter a cooling off period. Khrushchev said yes, but Kennedy said no. One Soviet-flagged ship was stopped and boarded. On October 28 Khrushchev agreed to dismantle the missile sites subject to UN inspections. The U.S. publicly promised never to invade Cuba and privately agreed to remove its missiles in Turkey, which were by then obsolete and had been supplanted by submarines equipped with UGM-27 Polaris missiles. This crisis brought the world closer to nuclear war than at any point before or since. In the end, "the humanity" of the two men prevailed.The crisis improved the image of American willpower and the president's credibility. His approval rating increased from 66% to 77% immediately thereafter.