The Cuban Missile Crisis was even scarier than we previously thought. It turns out that in November 1962, a month after America thought the crisis had ended, the Soviet Union still had tactical nuclear weapons in Cuba. The United States had never known they were present, and so never demanded their removal.
The Soviets took them back when they became alarmed at Castro’s erratic behavior. He considered the weapons his, and was on the verge of announcing to the world that Cuba was a nuclear power.