During Operation Barbarossa, the US provided the USSR with large amounts of material aid, trucks, weapons, fuel etc. And as I´ve understood, there is still a debate wheter the American aid saved the USSR from defeat at the hands of Hitler. Some Western historians claim that´s the truth. Russian historians denies this (no surprise) and instead claim that the aid was helpful, but not decisive for the outcome of the war.
I´m not too familiar with the issue, so I ask you learned people what your opinion is:
What if the USSR had not recieved any material aid from USA during WWII?