Talks held between 1959 and 1961 to solve the Berlin problem
1. Geneva in May 1959 (no agreement reached)
2. Camp David in September 1959 (Khrushchev did not withdraw the Berlin ultimatum)
3. Paris in May 1960 (talks cancelled after U2 spy plane shot down)
4. Vienna in June 1961 (Kennedy refused to negotiate, Khrushchev determined to get his way)