For one, Soviet Russia together with the German Reich sliced Europe in two parts on the map and then invaded Poland together with Germany.
After that one mad dictator was faster than the other.
After that one mad dictator was faster than the other.
29 September 1938 - https://en.wikipedia.org/wiki/Munich_Agreement
23 August 1939 - https://en.wikipedia.org/wiki/Molotov%E2%80%93Ribbentrop_Pac...
Then the Reich and Soviet Russia sat together cut Europe in halt. Stalin was by far the better strategist though, he talked to the French and English, waited until the Reich invaded Poland and then invaded Poland and the Baltic states second.