A file of reports, correspondence, and memoranda discussing the likelihood of the Soviet Union taking armed action against Yugoslavia following the falling out between Josef Stalin and Marshal Tito in the late 1940s. Subjects discussed in this file include Soviet military dispositions in Eastern Europe; the comparative military strength of the Soviet and Yugoslav armed forces; the potential courses of action available to both countries in the event of an invasion; the forces available to the Soviet satellite states; the likelihood of adverse weather conditions over the winter; and the implications of the Soviets gaining control of Yugoslavia.