"In the opinion of another historian, Bruce Miroff, Kennedy's reaction to Krushchev's blustering revealed an acute inferiority complex, which the president manifested by a perverse need to prove his leadership capabilities. As a result, rather than ignoring or minimizing Krushchev's threats, as Eisenhower usually did, Kennedy personalized them and converted them into tests of will, in the process manufacturing crises that need not have been. "There was really nothing in that [Eisenhower] era comparable to the Berlin crisis of 1961 and the Cuban missile crisis of 1962," Miroff observes, both of which represented the closest approaches to a superpower nuclear war during the Cold War. For whatever reasons, whether they were primarily ideological, political, or psychological- and all were important- in formulating his initial response to the Soviet Union Kennedy chose to emphasize Krushchev's bellicose actions rather than his friendly gestures. Only after Kennedy had proved to the Soviet leader that he was not soft on communism would diplomacy make any headway during his presidency."