In which capacity did this person, who established the Bogd Khan puppet government, serve in the Russian Civil War?
Jalkhanz Khutagt Sodnomyn Damdinbazar:  He served as Prime Minister twice; first in 1921 as part of the Bogd Khan puppet government established by Roman von Ungern-Sternberg, and again from 1922 to 1923 under the revolutionary government of the Mongolian People's Party. Roman von Ungern-Sternberg: Baron Roman Nicolaus Maximilian von Ungern-Sternberg (Russian: Барон Ро́берт-Ни́колай-Максими́лиан Рома́н Фёдорович фон У́нгерн-Ште́рнберг ) (10 January 1886 NS – 15 September 1921) was an anti-Bolshevik lieutenant general in the Russian Civil War and then an independent warlord whose Asiatic Cavalry Division wrested control of Mongolia from the Republic of China in 1921 after its occupation.
anti-Bolshevik lieutenant general