"I want to tell you what, from the Russian point of view, the president and the United States have done for victory in this war," Stalin said. "The most important things in this war are the machines.... The United States is a country of machines. Without the machines we received through Lend-Lease, we would have lost the war."

Nikita Khrushchev offered the same opinion.

"If the United States had not helped us, we would not have won the war," he wrote in his memoirs. "One-on-one against Hitler's Germany, we would not have withstood its onslaught and would have lost the war. No one talks about this officially, and Stalin never, I think, left any written traces of his opinion, but I can say that he expressed this view several times in conversations with me."

https://www.rferl.org/amp/did-us-lend-lease-aid-tip-the-balance-in-soviet-fight-against-nazi-germany/30599486.html