The 1960 Four Power Paris Summit between President Dwight Eisenhower, Nikita Khrushchev, Harold Macmillan and Charles de Gaulle collapsed because of the incident. Eisenhower refused to accede to Khrushchev's demands that he apologize. Therefore, Khrushchev would not take part in the summit. Up until this event, Eisenhower felt he had been making progress towards better relations with the Soviet Union. Nuclear arms reduction and Berlin were to have been discussed at the summit. Eisenhower stated it had all been ruined because of that "stupid U-2 business".

Along with Eisenhower, Macmillan and de Gaulle, what leader attended the Four Powers Paris Summit?