After the crisis , superpower relations improved , as Kennedy gave a conciliatory speech at American University on 10 June 1963 , recognizing the Soviet people 's suffering during World War II , and paying tribute to their achievements . Khrushchev called the speech the best by a U.S. president since Franklin D. Roosevelt , and , in July , negotiated a test ban treaty with U.S. negotiator Averell Harriman and with Lord Hailsham of the United Kingdom . Plans for a second Khrushchev-Kennedy summit were dashed by the U.S. President 's assassination in November 1963 . The new U.S. President , Lyndon Johnson , hoped for continued improved relations but was distracted by other issues and had little opportunity to develop a relationship with Khrushchev before the premier was ousted
assassination
Assassination of John F. Kennedy
Nikita Khrushchev