Kammala wannan jumla: A farkon yakin duniya na biyu, rukunin da ke kan doki na rundunar sojojin Mongoliya sun shiga cikin yakin Khalkhin Gol da sojojin Japan masu mamayewa. Sojojin Soviet a karkashin jagorancin Georgy Zhukov, tare da sojojin Mongolia, sun ci sojojin Japan na shida kuma sun kawo karshen yaƙe-yaƙe na Soviet-Japan. Bayan Yarjejeniyar Tsakanin Soviet da Japan na 1941, Mongolia ta kasance mai tsaka tsaki a cikin yawancin yaƙin, amma yanayin ta na nufin cewa ƙasar ta zama buffer tsakanin sojojin Japan da Tarayyar Soviet. Baya ga kiyaye kusan kashi 10% na yawan jama'a a karkashin makamai, Mongolia ta samar da dawakai miliyan daya da aka horar da su don amfani da Sojojin Soviet. Bugu da kari, wasu raka'o'in da aka kafa na Sojojin Mongoliya sun goyi bayan Sojojin Soviet a gefen yammacin yankin.
Tsarin Tsarin Manzuriya na Tsarin Manzanci a 1945. Sun kasance wani ɓangare na Soviet Mongolian Cavalry Mechanized Group karkashin umurnin I. A. Pliyev