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 of reporting provided by Oleg Penkovsky, a double agent in the GRU working for CIA and MI6. Although he provided no direct reports of the Soviet missile deployments to Cuba, technical and doctrinal details of Soviet missile regiments that had been provided by Penkovsky in the months and years prior to the Crisis helped NPIC analysts correctly identify the missiles on U-2 imagery. That evening, the CIA notified the Department of State and at 8:30 pm EDT, Bundy chose to wait until the next morning to tell the President. McNamara was briefed at midnight. The next morning, Bundy met with