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I’d be shocked if it were only 30%. The US and Canada supplied Russia with 450,000 Trucks. That includes the Studebakers on which they mounted their Katyushas. This was at a time when their factories were fully engaged producing tanks.

The US also supplied 2,000 locomotives at a time when they produced 200.

Then there were the tens of thousands of jeeps.

Without that alone, they would have had the same problem the Germans did when trying to project power at any distance from their supply bases. ie horses really struggle to bring up enough supplies, can’t do it fast enough, and your logistics corps requires far more manpower than it would if it were fully mechanized.

That’s to say nothing of the 15 million pairs of felt lined boots the US supplied the Red Army with.

Or the huge amounts of food.

Or 100% of their aviation fuel early on when the Germans knocked out their refining capacity to refine that.

Or the western allies making good on their strategic metal reserve when that fell into German hands when Kiev fell.

and most of the aid was not even weapons. Most of it was food, transport and especially industrial equipment.