Abstract: The subject of this study is the discussion on March 14, 1918 in the House of Commons of Great Britain of the Japanese intervention in the Far East and Siberia as the events of the British intervention in Russia. In this regard, the speeches of deputies from various political forces and a high-ranking official of the Military Cabinet of the United Kingdom in the lower house of parliament are disclosed and analyzed. Thanks to the content analysis method and the system method, not only the positions and arguments of the participants in the discussion are presented in detail, but also the connection of their speeches with the military-political and international situation that developed in March 1918 and which influenced the dynamics of the discussion is revealed. The scientific novelty is that for the first time in the historiography of the Civil War and foreign intervention in Russia, a meeting of the lower house of Great Britain on the Japanese intervention in the Far East and Siberia is considered in the context of the history of British intervention policy in Russia and the significance of this event for this policy. The main conclusions of the study are that, despite the lack of a unified position in the House of Commons on the issue of Japanese intervention in the Far East and Siberia, the War Cabinet has caught the trend in favor of Japanese intervention in these Russian regions. As a result, he cautiously began to build a policy of intervention against Russia and to determine the place of Japanese intervention in it. Only large-scale events could force the House of Commons to adopt the policy that the Cabinet considered necessary to pursue in the current circumstances.

Abstract: The object of this research is the role of British War Cabinet in organization of intervention in Far East and Siberia. The subject of this research is the actions of British government pertinent to the agreement of the terms and conditions of intervention with the United States, Japan, and Soviet authorities in December 1917 – August 1918, which was a challenging task due to the clash of interests of the United States and Japan and their approaches towards resolution of the problems in these regions, not to mention the equivocal position of the Soviet Russia in discussing the “intervention upon agreement”, i.e. integration approved by the Soviet authorities. The main research methods are the following: chronological, comparative and narrative, substantiated by the strict chronological framework and the nature of the involved sources, some of which are used for the first time. The scientific novelty is defined by the fact that the attraction of the vast amount of sources from the National Archive that have not been previously introduced into the scientific discourse, allows studying the insufficiently covered within the Russian historiography topic on the role of United Kingdom in organization of intervention in Far East and Siberia with regards to agreeing the terms of intervention with the United States, Japan, and Soviet government. The conclusion is made that using its political leverage, the British government not only actively participated in conversations with Japan, United States, and Soviet authorities, but practically formed the agenda for such negotiations, persistently encouraging the partners to follow their directives.