13-day confrontation between the Soviet Union and Cuba on one side, and the United States on the other, in October 1962. It was one of the major confrontations of the Cold War, and is generally regarded as the moment in which the Cold War came closest to turning into a nuclear conflict. It is also the first documented instance of the threat of mutual assured destruction (MAD) being discussed as a determining factor in a major international arms agreement.

After provocative political moves and the failed US attempt to overthrow the Cuban regime (Bay of Pigs, Operation Mongoose), in May 1962 Nikita Khrushchev proposed the idea of placing Soviet nuclear missiles on Cuba to deter any future invasion attempt. During a meeting between Khrushchev and Fidel Castro that July, a secret agreement was reached and construction of several missile sites began in the late summer. Such a move would also neutralize the US’s advantage of having missiles in Turkey. These preparations were noticed and on 14 October, a US aircraft took several pictures clearly showing sites for medium-range and intermediate-range ballistic nuclear missiles (MRBMs and IRBMs) under construction. These images were processed and presented on October 15, which marks the beginning of the 13-day crisis from the US perspective.

The United States considered attacking Cuba via air and sea, but decided on a military blockade instead, calling it a “quarantine” for legal and other reasons. The US announced that it would not permit offensive weapons to be delivered to Cuba, demanded that the Soviets dismantle the missile bases already under construction or completed, and return all offensive weapons to the USSR. The Kennedy administration held only a slim hope that the Kremlin would agree to their demands, and expected a military confrontation.

On the Soviet side, Premier Nikita Khrushchev wrote in a letter from October 24, 1962, to President John F. Kennedy that his blockade of “navigation in international waters and air space” constituted “an act of aggression propelling human kind into the abyss of a world nuclear-missile war”. However, in secret back-channel communications the President and Premier initiated a proposal to resolve the crisis. While this was taking place, several Soviet ships attempted to run the blockade, increasing tensions to the point that orders were sent out to US Navy ships to fire warning shots and then open fire. On 27 October, a U-2 plane was shot down by a Soviet missile crew, an action that could have resulted in immediate retaliation from the Kennedy crisis cabinet, according to Secretary of Defense McNamara’s later testimony. Kennedy stayed his hand and the negotiations continued.

The confrontation ended on October 28, 1962,when Kennedy and United Nations Secretary-General reached an agreement with Khrushchev. Publicly, the Soviets would dismantle their offensive weapons in Cuba and return them to the Soviet Union, subject to United Nations verification, in exchange for a US public declaration and agreement never to invade Cuba. Secretly, the US also agreed that it would dismantle all US-built, armed with nuclear warheads, which were deployed in Turkey and Italy against the Soviet Union.

After the removal of the missiles and light bombers from Cuba, the blockade was formally ended ,on November 20, 1962.

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