After days of deliberation, Kennedy and Khrushchev finally reached a compromise on October 28. Crisis tensions eased, but the ordeal was not yet over. The two superpowers still had to hammer out the terms of a formal agreement. During the course of the final negotiations Castro, who felt betrayed by Khrushchev, tried to halt the removal and inspection of the missiles. Eventually, with the help of the U.N., Castro backed down and the two sides reached an agreement. A U.N. inspection team was assigned to monitor the removal of the missiles and the demolition of the missile bases in Cuba. Then, the Soviet Navy shipped the missiles back to the U.S.S.R