The document summarizes the key events of the Cuban Missile Crisis between the Soviet Union, United States, and Cuba in 1962. It explains that Cuba had established a communist government under Fidel Castro after overthrowing the US-backed dictator. In response, the US broke off diplomatic relations with Cuba and unsuccessfully tried to overthrow Castro. Subsequently, the Soviet Union provided missiles, weapons, and personnel to Cuba, escalating tensions with the US. This led to a 13-day standoff between US and Soviet ships near Cuba before Khrushchev agreed to remove Soviet missiles from the island in exchange for the US agreeing not to invade Cuba.