how did an alliance between fidel Castro and nikita Khrushchev affect the world

In July 1962 Soviet premier Nikita Khrushchev reached a secret agreement with Cuban premier Fidel Castro to place Soviet nuclear missiles in Cuba to deter any future invasion attempt.
Nikita Khrushchev was the First Secretary of the Communist Party of the Soviet Union from 1953 to 1964. Nikita Khrushchev was Stalin's successor. He denounced policies of Stalin and announced the crimes against Soviet people committed by Stalin, and called for destalinization.
Fidel Castro was a Cuban revolutionary and politician who was the leader of Cuba from 1959 to 2008. He also served as the prime minister of Cuba. He also served as the first secretary of the Communist Party of Cuba from 1961 until 2011. He adopted a Marxist–Leninist model of development.
An alliance between Fidel Castro and Nikita Khrushchev affected the world as the construction of several missile sites began in the late summer, but U.S. intelligence discovered evidence of a general Soviet arms build-up on Cuba. On September 4, 1962, President Kennedy issued a public warning against the introduction of offensive weapons into Cuba.
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