This article discusses the causes of the cooling between the Allies at the end of the Second World War. According to the authors, the main driver of this was different geopolitical goals of the USSR, the United Kingdom and the United States. However, as the authors note, Moscow did not seek to force the export of communism. Its main objective was to create a post-war structure of Europe “security belt” from friendly to the Soviet Union border states. Cooling between the leaders of the “Big Three” was manifested for the discussion of the post-war Poland. Particularly in the article discusses the Yalta and Potsdam conferences, as well as attempts to nuclear blackmail the US against the USSR and the development plan of the British command of military operations against the Soviet Union. The article concludes with an analysis of the historical significance of the anti-Hitler coalition and the origins of the Cold War.