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 made locally by an undetermined Soviet commander, acting on his own authority. Later that day, at about 3:41 pm EDT, several US Navy RF-8A Crusader aircraft, on low-level photoreconnaissance missions, were fired upon. On October 28, 1962, Khrushchev told his son Sergei that the shooting down of Anderson's U-2 was by the "Cuban military at the direction of Raul Castro." At 4:00 pm EDT, Kennedy recalled members of EXCOMM to the White House and ordered that a message should immediately be sent to U Thant asking the Soviets to suspend work on the missiles while negotiations were carried out. During