[marktwain]

I wouldn’t call Stalin an ally with Hitler. They agreed to a tenuous non-aggression agreement which broken by Operation Barbarossa.

Hitler obtained huge amounts of raw material from the Soviet Union.

Russia learned how to make good tanks and considerable other technical advances from the Germans.

There was a lot of cooperation before Hitler invaded. Stalin was incensed, because he had expected to be the one to stab Hitler in the back.

[Hieronymus]

You are well named—you know your stuff and have a way with words. A good deal packed into four sentences, and the last one is definitely a keeper.