Nevertheless, even with the USSR considerable debate is made how much the Soviet success was because of American assistance via Lend Lease. This especially is true in regards to trucks supplied to the Red Army:
These trucks proved vital in the Red Army's advances across Eastern Europe and it's ability to out-manvuer the Wehrmacht in its "Deep Battle" Operations(the Red Army's counterpart to Blitzkrieg). David Glantz, one of the foremost authorities on the Eastern Front, has argued that American aid helped considerably in shortening the war. As he put it - "left to themselves, the Soviets might have taken 12 to 18 months longer to defeat the Wehrmacht."(source)Far more critical to the Soviet war effort was the supply of tactical vehicles, primarily from the United States. During the war, the Soviet Union produced only 343,624 cars and lorries due to the heavy commitment of major automobile factories like GAZ to armoured vehicle production. The USA alone provided the Soviets with 501,660 tactical wheeled and tracked vehicles, including 77,972 jeeps, 151,053 1-1/2-ton trucks, and 200,622 2-1/2-ton trucks. The aid was vital, not only because of the sheer quantity, but because of the quality. While Soviet auto*motive production concentrated almost exclusively on antiquated copies of American 1930 lorry designs, the vehicles provided under Lend-Lease were modern military designs with multiple powered axles and useful cross-country capability.
There was also the massive supplies of food, and the famous legend of how enough SPAM was exported to feed every Red Army soldier several pounds per day.