Background
The Cuban Missile Crisis emerged from the political-strategic configuration of the early 1960s Cold War. Fidel Castro’s revolutionary regime had taken power in Cuba in January 1959 and progressively aligned with the Soviet Union through 1960. The failed U.S.-sponsored Bay of Pigs invasion of April 1961 had substantially strengthened Castro’s domestic political position and confirmed the regime’s strategic dependence on Soviet military protection.
The strategic context: in 1962, the United States held a substantial advantage in deployed intercontinental ballistic missiles — approximately 200 to 30, by some contemporary estimates — and had deployed PGM-19 Jupiter intermediate-range missiles to Turkey in 1961, capable of reaching Moscow with 7-minute flight times. Nikita Khrushchev authorized the deployment of Soviet R-12 and R-14 ballistic missiles to Cuba in spring 1962, intending to address both the strategic imbalance and the political vulnerability of Cuba simultaneously. The Soviet operation, codenamed Anadyr, transferred approximately 50,000 Soviet military personnel, 42 ballistic missiles, and substantial supporting equipment to Cuba between July and October 1962 under maximum secrecy.
The thirteen days
The American discovery came on 15 October 1962 when U-2 reconnaissance photography taken on 14 October was analyzed by CIA photo-interpreters and identified Soviet medium-range ballistic missile sites near San Cristóbal, Cuba. President John F. Kennedy was briefed on the morning of 16 October. The first ExComm (Executive Committee) meeting at the White House was held the same morning.
16–21 October: Kennedy and ExComm secretly debated the appropriate response. The options under consideration included an immediate air strike against the missile sites, an invasion of Cuba, a naval blockade, and various diplomatic combinations. The internal debate was substantial; senior military advisers favoured immediate military action, while Kennedy’s brother Robert F. Kennedy (the Attorney General) and Secretary of Defense Robert McNamara favoured the blockade option.
22 October: Kennedy announced the crisis in a televised address to the American public and declared a naval quarantine of Cuba — selectively intercepting Soviet shipping bound for Cuba while not formally declaring a state of war. He demanded the withdrawal of the missiles. The U.S. military went to DEFCON 3 (later DEFCON 2 on 24 October), the highest peacetime alert in U.S. nuclear history.
24 October: The quarantine line was reached by approximately 19 Soviet ships bound for Cuba. Most of the ships carrying military equipment turned back. Several oil tankers and other non-military Soviet ships continued toward the line and were eventually allowed to pass after inspection.
26–27 October (“Black Saturday”): The crisis approached its most dangerous point. A U-2 reconnaissance flight over Cuba was shot down by a Soviet surface-to-air missile, killing the U.S. pilot Major Rudolf Anderson; another U-2 strayed into Soviet airspace over Siberia. A Soviet submarine commander (Vasily Arkhipov, aboard B-59) deliberated and ultimately vetoed the launch of a nuclear-armed torpedo against the American destroyers that were attempting to surface his submarine. The Soviet government received a back-channel signal from Robert F. Kennedy on the evening of 27 October offering a deal: Soviet missile withdrawal from Cuba in exchange for a U.S. non-invasion pledge and (secretly) a U.S. withdrawal of the Jupiter missiles from Turkey within several months.
28 October: Khrushchev announced the Soviet withdrawal of the missiles via Radio Moscow on the morning of 28 October. The crisis was effectively over.
The settlement
The publicly-announced deal: the Soviet Union withdrew its missiles from Cuba; the United States pledged not to invade Cuba. The secret component: the United States withdrew its Jupiter missiles from Turkey approximately six months later, in a way that maintained the political appearance of an unconditional Soviet retreat. The secret component was not declassified until the 1980s and continued to shape the strategic interpretation of the crisis for decades.
The settlement produced several substantial subsequent agreements: the Moscow-Washington hotline (effective 30 August 1963), the Limited Test Ban Treaty (signed 5 August 1963, banning atmospheric nuclear testing), and a substantially more restrained pattern of subsequent superpower direct-confrontation diplomacy. The pattern of subsequent Cold War conflict shifted toward proxy wars in the developing world rather than direct nuclear-confrontation crises.
Consequences
The crisis confirmed the political-strategic reality of mutual nuclear deterrence and substantially shaped the subsequent intellectual culture of nuclear strategic studies. Graham Allison’s Essence of Decision (1971) used the crisis as a foundational case study in foreign-policy decision-making theory. The institutional memory of the crisis remained a substantial restraining factor on subsequent American and Soviet nuclear-strategic behaviour through the rest of the Cold War.
The crisis also produced substantial domestic-political consequences in both countries. Castro remained in power in Cuba until 2011 (with his brother Raúl succeeding); the Cuban-American political relationship has continued, in modified form, to the present. Khrushchev was removed from Soviet leadership in October 1964, with the Cuban crisis cited as one of the operative complaints. Kennedy’s domestic political position was substantially strengthened by the crisis and remained so until his assassination thirteen months later.
The recently declassified evidence of how close the crisis came to nuclear catastrophe — particularly the documented near-launches of Soviet nuclear torpedoes by submarine commanders operating with substantial autonomy and limited communication with Moscow — has substantially reinforced the modern assessment that the world came closer to thermonuclear exchange in October 1962 than at any other point in human history. The 1962 crisis remains the defining case study in the strategic vulnerability of any nuclear-weapons system to operational miscalculation.