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The Soviet Union also had problems dealing with Fidel Castro, according to a Soviet document made public this month by Svetlana Savranskaya, a Russia analyst for the National Security Archive.

Deputy Premier Anastas Mikoyan traveled to Cuba that Nov. 2 and spent 20 days in tense talks with the Cuban leader, who was angry the Soviets had reached a deal without consulting him.

Castro lobbied hard but unsuccessfully to keep the tactical nuclear weapons that the Americans had not learned about.