In the mid-60s USA decided to deploy missiles in Turkey.The USSR took it as a threat to its security,and in answer,announced that it deploys the rockets in Cuba.America threatened that if it happens,USA will invade Cuba.The threat was answered by Nikita Khruschev,the General Secretary of the Communist Party of the USSR,with his famous "We shall bury you".
For about 10 days,the world was on the verge of the nuclear war.
But finally,the leaders of both cuntries-Kennedy in the USA and Khruschev in the USSR-ompromised ; the USA did not deploy rockets in Turkey,and the USSR annuled the deployment of Soviet rockets in Cuba.