Which is why the peaceful trading before the invasion miiiiiight have been a miscalculation by Stalin that led to millions of deaths.
Germany invaded because they needed resources that they couldn't get elsewhere. Letting them bootstrap that into the invasion, among all of the mistakes that were made in WWII, seems like it might have been one of the top ones.
Everyone made mistakes immediately before WW2. Some in the West even liked Hitler. Stalin sought support from the West and was denied; partially the reason for the Molotov-Ribbentrop pact. The British also made mistakes, and let's not forget the French.
None of this detracts from the fact the Soviet Union was ome of the biggest victims in WW2 and that they were traumatized by this.
Germany invaded because they needed resources that they couldn't get elsewhere. Letting them bootstrap that into the invasion, among all of the mistakes that were made in WWII, seems like it might have been one of the top ones.