I wrote an open letter, to President Eisenhower and Premier Khrushchev, addressing them as 'Most Potent Sirs'. In it I tried to make clear the fact that the things which they held in common were far more numerous and far more important than their differences, and that they had much more to gain than to lose by cooperation. ... Almost at once a reply come from Premier Khrushchev. No answer came from President Eisenhower. Two months later John Foster Dulles replied for him. ... They were soon published in book form with an introduction by that paper's editor, Kingsley Martin, and a final reply from me to Mr Dulles and Mr Khrushchev.
Source: The Autobiography of Bertrand Russell, v.3 chap. 3
More info.: https://russell-j.com/beginner/AB33-020.HTM