The Cuban Missile Crisis occurred in October 1962 and brought the US and Soviet Union close to nuclear war. The Soviet Union had placed nuclear missiles in Cuba to counter the US's nuclear advantage. US reconnaissance flights discovered the missile sites under construction in Cuba. President Kennedy established a naval blockade of Cuba and demanded the Soviets remove the missiles. After several tense days of negotiations, the Soviets agreed to remove the missiles in exchange for the US agreeing not to invade Cuba and removing its missiles from Turkey. The crisis ended on October 28th, averting nuclear conflict.