Yes, that’s what I would have presumed, too.
As similar as the practices of both regimes were, as irreconcilable were the theoretical principles upon which they were based.
However, had Hitler not been the utter madman that he was, a Soviet victory might not have been a foregone conclusion.
Assuming we'll send the supplies to the Soviets but Hitler won't dare to attack Britain and USA.
But that move would probably provoke Hitler into declaring war.