Query: What did Khrushchev demand that Eisenhower do?
Context: 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.