Think of modern military vehicles like aircraft and tanks as if they were a formula one car.
After each f1-race you need to basically take the whole car apart and do a full engine rebuild until you can drive it again.
That is the cost of peak performance.
As for ukraine, ukraine is basically the country depicted in "Empire of dust" but populated with low-functioning retarded slavs.
They don't maintain shit. Anything they are given falls into disrepair, be it roads, sewage tunnels, electricity grid, or weapons systems like tanks.
When they take the tanks out they will run them with zero maintenance until it either is destroyed or breaks down.
Watch and remember what happens with the Abrahams once they start using them. The exact same thing will happen to the F16's if and when they get them.