Yep, it is a numbers game. The Neocons gave the ukes a bunch of their ‘Wonder Weapons’ and the ukes (or whoever was driving them) got destroyed, and so no more ‘Wonder Weapons’ for the ukes.
As far as Russia goes, just like WW2, they steel keeps coming in, even if they lose some tanks along the way.
Er, this is your problem. You aren’t thinking numerically, only rhetorically. SOME western equipment was destroyed. More wasn’t. In the process most of that western equipment (supplied in miserly numbers, note) has proven useful to Ukraine.
The Russians are losing a heck of a lot of everything. Their stockpiles (rusty parking lots) of tanks, APCs and artillery are emptying out. Check the satellite count guys.