The present study attempts to examine and analyze the diplomatic events of the period 1938-1939 between the Soviet Union (USSR) and the West. This article argues that the Western policy of “appeasement” did not merely foment the revisionist and expansionist policies of the Third Reich, but it also underlines the failure of French and British governments to ensure Soviet support in the fight against Nazi Germany through the signing of a binding military agreement. This is one of the main reasons for the outbreak of World War II. The facts are presented on the basis of primary archival material, this approach is part of the history of international relations between nations and states. The main goal is to highlight the diplomatic and geopolitical causes of the international problems between the USSR and the Western countries and not the gleaning of schematic and theoretical positions on the issue of World War II.