Why did the presence of soviet missiles in Cuba trigger an international crisis and how was that crisis solved?

The presence of Soviet missiles in Cuba in 1962 triggered an international crisis because it brought the Cold War superpowers, the United States and the Soviet Union, to the brink of nuclear war, posing an immediate threat to U.S. national security. The crisis escalated when the U.S. discovered the missiles and responded with a naval blockade to prevent further Soviet shipments. Ultimately, the crisis was resolved through intense negotiations, where the U.S. agreed to publicly declare not to invade Cuba and secretly promised to remove its missiles from Turkey in exchange for the withdrawal of Soviet missiles from Cuba. This resolution marked a pivotal moment in U.S.-Soviet relations, leading to improved communication and the establishment of the "hotline" between the two nations.