They'd had some border skirmishes before WWII even started, with tens of thousands of casualties on each side. The 1941 neutrality pact was a result of a combin

They'd had some border skirmishes before WWII even started, with tens of thousands of casualties on each side. The 1941 neutrality pact was a result of a combined Soviet/Mongolian force defeating and removing the Japanese from Mongolia. https://en.wikipedia.org/wiki/Soviet%E2%80%93Japanese_border_conflicts https://en.wikipedia.org/wiki/Soviet%E2%80%93Japanese_border...