I think they'll have what it takes. There are Ukraining pilots who've been training for the f16 for a while, and about 10,000 Ukrainians are graduating from training as fresh troops in the UK fully equipped each month, and thats just the U.K. and not any other countries.

Ukraine is in a position where the numver of trained troops they're gaining is fsr exceeding their losses, and Russia is losing hundreds a day, every day, and is increasingly poorly armed.

We're in a position where as time goes on Ukraine is becoming increasingly more powerful and Russia increasingly weaker. They're also in this position explicitly because Russia broke all of its promises for peace prior to this and no new promises can br trusted.

Fighting Russia in Crimea would be hard, bloody, and costly, but Russia has essentially forced a situation where Ukraine has no real other option, and is also being armed well enough and fast enough that this time next year they'll have an army capable of actually doing it.