The Soviets gave the Germans a free hand to begin the war by splitting Poland via the Molotov pact. Without that agreement, and without the preceding years of Soviet resource shipments and technical exchanges, it is unclear if the European war would have happened.
This is about as far as I could guess as well. Unfortunately by this logic you could just as easily implicate France and the UK for the Munich agreement, as well as the failure to excercise their defense pact with Poland. So essentially every party with exception of Germany and the United States is at fault for WW2. This also leaves the Pacific theatre unaccounted for as you implied. So I'm very curious what the original commenter intends.
It doesn't merit more response, you can just look at the reality of actual fascist states. Economic stagnation, the most extreme corruption and incompetence, and cruelty beyond imagination. True masterminds.
The Soviets gave the Germans a free hand to begin the war by splitting Poland via the Molotov pact. Without that agreement, and without the preceding years of Soviet resource shipments and technical exchanges, it is unclear if the European war would have happened.