Abstract: Communist International (Cominter), which in its practical activities was responsible to carry out the world revolution, was not only a tool of the Soviet foreign policy, but also became its obstacle in certain conditions. After the outbreak of the war between Soviet Union and Germany, the establishment of international antifascist alliance made the relations between Soviet Union and America and Britain entered into a new stage. But, with a continuing victory of the allies against Germany in the war, the worry of America and Britain toward the Soviet Union increased, and this made the relationship between them fall into crisis from 1942 to the first half of 1943. In order to eliminate this crisis, assure the final victory of the antifascist war, and resolve the problem about the postwar arrangement at the same time, Stalin made a decision, as a friendly gesture to the West, to dissolve the Cominter in May 1943. The dissolution of the Cominter marked the beginning of postwar cooperation between USSR and U.S. and Britain.