Why were relations between Russia and the United States tense in Berlin in 1961? The Berlin Wall had created new restrictions on movement.
Germans had banned Western influence in East Berlin.
US ambassadors were refusing to cross the border.
Khrushchev and Kennedy had held a failed peace conference.

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Explanation:

The Berlin Crisis started when the USSR launched an ultimatum demanding the withdrawal of all armed forces from Berlin, including the Western armed forces in West Berlin. The crisis culminated in the city's de facto partition with the East German erection of the Berlin Wall.

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