In October 1962, U.S. spy planes discovered that the Soviet Union was placing nuclear missiles in Cuba, sparking the Cuban Missile Crisis. President Kennedy convened a committee to discuss response options, including doing nothing, negotiating, invading Cuba, blockading Cuba, bombing missile sites, or using nuclear weapons. After much debate, the committee recommended a naval blockade of Cuba. Khrushchev eventually agreed to remove the missiles in exchange for the U.S. promising not to invade Cuba. The crisis heightened Cold War tensions but also established a direct communication line between the U.S. and Soviet leaders.