Question: What is the military power's name formed by the new government of the soviet Union and fought in the the Soviet-Japanese border conflicts among the Soviet Union, mongolia, japan and Manchukuo  in 1939?
Sentence (from "Battles of Khalkhin Gol"): The Battles of Khalkhyn Gol were the decisive engagements of the undeclared Soviet–Japanese border conflicts fought among the Soviet Union, Mongolia, Japan and Manchukuo in 1939.
Relevant evidence: Yes