Lend Lease?
LOL!
Massive logistics support from USA => USSR, never repaid.
If you’ve never done so, read From Major Jordan’s Diaries, especially the tables of materials given.
The Russians built tanks and guns, everything else we supplied. Their motor transport pretty much all came from Detroit, locomotives, massive amounts of foodstuff, strategic materials, on down the line.
They had received 10 billion 982.1 million. (Source: Wikipedia)
36 nations were recipients of Lend-Lease Loans. As far as I can learn, only Great Britain has finished repaying the loan in full with the 2% interest included, in 2006.