There’s a guy on YouTube called “Perun”. He does incredibly deep-dives on all this with regards to Ukraine specifically, and also more generally the economics of military expenditures. He occasionally interviews experts, some of which he is able to record.
The short version is that Russia is having to dip into old, often unreliable, stockpiles to feed their war machine. They’re bringing very old systems back online because they have run out of munitions for the newer ones. Meanwhile, Ukraine is receiving infusions of new equipment from the west, plus they have simply taken some modern Russian equipment (e.g. T72s) that was abandoned.
It’s worth checking his channel out if you want to get into this. But be forewarned, his videos are about an hour each, and are very deep-dives. Go back about 4 months, at least, to get the details I just described.
I doubt the suppliers you mentioned will get much. They’re mostly aerospace, and Ukraine isn’t buying F35s. They’re receiving hardware from Poland, Germany, and others, that have nothing to do with American aerospace.
This one deals with some of the economics: 6 Months of War in Ukraine - Economics, Endurance & the Energy War - YouTube