West Berlin is "the testicles of the West. Every time I want to make the West scream, I squeeze on Berlin" claimed the Soviet leader Nikita Khrushchev in 1962. The Soviet leaders viewed Berlin in similar respects, "a dangerously exposed western enclave within the emerging Soviet bloc, as a place they could exert pressure" (Friedman, 2009).
Friedman, M.J. (2009) Introduction. [online] http://www.america.gov/media/pdf/books/the-berlin-wall.pdf
U.S. Department of State Bureau of International Information Programs (2009) The Berlin Wall: 20 Years Later. [online] http://www.america.gov/media/pdf/books/the-berlin-wall.pdf