sentences:  This did not prevent discussions between the Superpowers.In June 1961, President John F. Kennedy and First Secretary Nikita Khrushchev met in Vienna, and in December the United Nations General Assembly approved a draft joint resolution on principles for negotiating disarmament.This period also saw the beginnings of U.S. - U.S.S.R. cultural exchanges, notably the visit of poet Robert Frost to Moscow.