"It is probable that Krushchev also wanted a dramatic way of achieving a breakthrough on the Berlin problem, and perhaps expected that the successful deployment of missiles in Cuba would do much to neutralize U.S. nuclear superiority, thereby enabling him to increase Soviet pressure on that beleaguered city. In addition, some analysts believe, the successful deployment of Soviet missiles in Cuba would distract attention from Krushchev's growing domestic problems, primarily the mediocre performance of Soviet agriculture, and solidify the leadership of the Soviet Union in the international communist movement, which was being increasingly challenged by the Chinese."