After Joseph Stalin died in 1953, “peaceful coexistence” became subject of numerous discussions. In his Christmas Message of 1954, Pius XII defined possibilities and preconditions for peaceful coexistence. He indicated Vatican willingness to practical cooperation, whenever possible in the interest of the faithful. The slow pace of de-Stalinisation and the Soviet crackdown on the Hungarian Revolution did not produce results, aside from modest improvements in Poland and Yugoslavia after 1956. January 1958, Soviet Foreign Minister Andrey Gromyko expressed willingness of Moscow, to have formal relations with the Vatican in light of the position of Pope Pius XII on World peace and the uses of atomic energy for peaceful purposes, a position, which he claimed was identical with Kremlin policy. The Vatican did not respond officially, and reported unofficial contacts will not be known until 2028, when Vatican Archives open access to all documents of the pontificate of Pius XII.