 Nyora kupfuurira kweiyi ndima - Muna September 1919, akagoverwa kuSiberian Expeditionary Army, uye akabatira mukupindira kweJapan muSiberiamunguva yeHondo Yenyika yeRussia, yaiva muManzhouli. Basa raSasaki raive rekushanda semukuru wekubatana pakati pemauto eJapan neChina pasi peChinese-Japanese Chibvumirano cheMasoja chaMay 1918, uye gare gare, kubatsira kupa rubatsiro rwemauto kuna White Russian Cossack mutungamiri Grigory Mikhaylovich Semyonov. Pashure pokunge Japan yagura rubatsiro kuna Semyonov maererano neGongota Agreement ya1920, mukuru waSasaki akamuudza kuti abatsire Semyonov kutizira kumabvazuva kuenda kuPrimorskaya Oblast, zvichipesana nemutemo wemauto. Mushure mokupedza basa iri, Sasaki asina kuziva akaudza vakuru vakuru veJapan muVladivostok, paakadzingwa nokuda kwekubatsira Semyonov, uyo kuvapo kwake munharaunda yacho kwaigona kukanganisa kuedza kweJapan kutsigira Far Eastern Republic nyika isina kwayakarerekera. Shure kwaizvozvo, Sasaki akaderedzwa chinzvimbo, akapiwa basa risina mabasa muVladivostok, uye muna Chikumi 1921, akaita kuti adzokere kuJapan kunoshanda semutungamiri wekambani chinzvimbo chakaderera chaakange atove nacho mushure mekupedza kudzidza kuArmy War College. Sasaki akanyora kuti chiitiko ichi chakamubata zvikuru, uye kuti akafunga zvakakomba kusiya mauto, asi akafunga kuramba achitevera zano reshamwari yake Sakai Takashi, uyo aishandira muChina Dhipatimendi paImperial Japanese Army General Staff Office. Muna December 1921, akagadzwa kuti ashande muDhipatimendi reChina, achiratidza kudzoka kwake kubatanidzwa zvizere muzvinhu zveChina. 