It was clear in the thirties that there will again be war in Europe. But who wit...

It was clear in the thirties that there will again be war in Europe. But who with whom at what time against whom was not so clear.

Somebody had to defeat the Germans, the Soviet Union had the main burden in the end.

Fiasco: The Anglo-Franco-Soviet Alliance That Never Was and the Unpublished British White Paper, 1939–1940 https://www.tandfonline.com/doi/abs/10.1080/07075332.2018.14...

German–Polish declaration of non-aggression

"The new constellation made the Soviet Union fear a joint German-Polish attack."