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 Project actions as the Cuban Missile Crisis escalated (as pictures of Soviet nuclear weapons stationed on the North shore of Cuba were obtained by American intelligence via satellite reconnaissance), but "returned to its policy of sponsoring terrorism against Cuba as the confrontation with the Soviet Union lessened." However, Noam Chomsky has argued that "terrorist operations continued through the tensest moments of the missile crisis", remarking that "they were formally canceled on October 30, several days after the Kennedy and Khrushchev agreement, but went on nonetheless". Accordingly, "the Executive Committee of the National Security Council recommended various courses of action, "including ‘using