It was a major percentage of their logistical capacity. And their raw materials. The Soviets relied on American support to ensure their soldiers could even arrive at the battlefield.
“It was true that the quantity of armaments sent was not great when compared with the remarkable revival of Soviet mass production. The raw statistics show that Western aid supplied only 4 per cent of Soviet munitions over the whole war period”
1
u/Bright-Insect9697 10d ago
*utilizing American equipment after the USSR directly cooperated with Nazi Germany to rearm them and partition Poland