Also a point is that the USA and the rest of Ukraine’s friends are supplying Ukraine with surplus equipment.
They haven’t used any of their prime resources. Russia, in the meanwhile, has used up most of it’s supposed “high tech, modern equipment “
, used up all their military trucks and have far, far fewer working tanks.
Or flagships.
The USA can give Ukraine it’s old stuff and that’s still enough to kick Putin’s...
I’ll also note that disposing of old US equipment opens the dorr to replacing it with new stuff.