Cuban Missile Crisis established a naval blockade on October 22 to prevent further missiles from reaching Cuba; Oval Office tapes during the crisis revealed that Kennedy had also put the blockade in place as an attempt to provoke Soviet-backed forces in Berlin as well. The US announced it would not permit offensive weapons to be delivered to Cuba and demanded that the weapons already in Cuba be dismantled and returned to the Soviet Union. After several days of tense negotiations, an agreement was reached between US President John F. Kennedy and Khrushchev. Publicly, the Soviets would dismantle their offensive weapons in Cuba and
Cuban Missile Crisis in a "Memorandum for the President" describing the "Post Mortem on Cuba." Kennedy's Oval Office telephone conversation with Eisenhower soon after Khrushchev's message arrived revealed that the President was planning to use the Cuban Missile Crisis to escalate tensions with Khrushchev and in the long run, Cuba as well. The President also claimed that he thought the crisis would result in direct military confrontations in Berlin by the end of the next month. He also claimed in his conversation with Eisenhower that the Soviet leader had offered to withdraw from Cuba in exchange for the withdrawal of missiles from Turkey