2) We, on our part, would agree — upon the establishment of adequate arrangements through the United Nations to ensure the carrying out and continuation of these commitments — (a) to remove promptly the quarantine measures now in effect and (b) to give assurances against an invasion of Cuba. I am confident that other nations of the Western Hemisphere would be prepared to do likewise.

Second letter to Nikita Khrushchev, 27 October 1962