Without the Allies, Russia would have lost ...
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Except, the Russian winter killed most of Germany’s crack troops - moreover there were way more Russians than Germans, Germans who where not in the business of forcing their troops into battle like the Russians. It would just have taken longer - Germany was fighting for mere territory, while the Russian were fighting for their homes, families and the Motherland.
The allied aid made the war end quicker. Hitler just did not have the manpower to “wipe out” the Russians. Plus, Russia was simply too big to hold, let alone control.
I’ll let historians argue from here - I have other things to do.