Lend-lease, while critical help, is often overplayed in the West as a way to diminish the Soviet contribution to the war -- this is in itself the legacy of historical views shaped by the Cold War and (unsurprisingly) by ex Wehrmacht officers who collaborared with the West after WW2. There's no credible mainstream analysis that has Germany winning against the Soviet Union. In fact, it is often argued that by starting Barbarossa, Hitler effectively lost the war. Germany didn't have the manpower, logistics capabilities or equipment to take on the Soviet Union.
That's not to say it wouldn't have cost the Soviets a lot more time, effort and bloodshed to defeat the Nazi war machine without the help of the Western Allies.
I'm not Russian and I'm completely uninterested in how current Russia and Putin are spinning this, by the way.
The keyword is "lend-lease" [0]. About 5% of weapons for 1942 Soviet offensive operations, decisive for the final outcome, were US-made. And 80% of cars and trucks. And lots of raw material.
[0] https://en.m.wikipedia.org/wiki/Lend-Lease