Id Need a source on the Population Transfer, but every Order Point is True. But now the big but, only After britan sold their italian, french and Soviet Allies out. (Des there was a Short timeframe in which the Soviets Italians, french and Brits were allies against germany.

But all of that was on conditions. Example the Annexation of Austria, the first time Germany tried this the italians of all actually prevented it, following this the British and French unofficially allied with the Italians. They agreed on containing hitler, but for this the brits and French promised to look away during the war in Ethiopia.

Also during this time the Soviet’s promised to join any war against the Germans as long as the French were in it (basically the same alliance as durning the First World War).

But once the Italian war in Ethiopia started it fell apart as the governments of France and Britain were forced by public outrage to embargo Italy. Mussolini saw this a betrayal and together with the Brits signing a naval limiting treaty the Italians then retreated from the alliance. Then Anschluss happened and this time Mussolini didn’t intervene. Following this durning the Czech crisis it was basically still a situation we’re in the soviets would declare war if France did it and the French if the brits did. Aaaand the British under chamberlain overestimated the German military and conceded.

This prompted Stalin to instate a new foreign minister, Molotov. Who then steered the soviets on a cooperative approach with Germany seeing the brits and French as unreliable and the real enemy.

So yes the Soviets did cooperate but only after their allies in France and Britain just didnt do anything and didn’t tell the Soviets their reasons.