Many people consider it a walking distance. If you go on foot both ways but sit 8h at work you can still find it dificult to hit 10k steps per day (WHO recomendation IIRC).
Just do not forget they joined Germany in the invasion of Poland in September 1939. Only because of the termination of Molotov–Ribbentrop Pact by Nazies Soviets were forced to fight them.