シベリア出兵
Promoted to colonel on July 24, 1918, Araki served as a Staff Officer at Expeditionary Army Headquarters in Vladivostok in 1918 and 1919 during the Japanese Siberian Intervention against the Bolshevik Red Army, and was commander of the 23rd Infantry Regiment. During his time in Siberia, Araki carried out secret missions in the Russian Far East and in Lake Baikal.