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I'm not asking about net benefit (most would agree the Germans benefitted more from trade under the M-R pact), but while trading, the Soviets were not giving away supplies for free. They were pretty much insisting on on-time payments from the Germans in terms of coal, military and industrial tech, at least through the fall of France.

The Germans didn't pay up on all their obligations through June 22nd, but they did have exports to the USSR.

What use did the USSR make of them during the war?
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