Hopefully some current or former combat pilot will get on this forum to splain to everyone that you don’t jump from being qualified on a gen 1 aircraft to a gen 2 aircraft over night. Going from MIG21 to a MIG 29 is a 3-6 month deal. Going to an F16 its more like 12 mos. My understanding is that most of these Ukrainian pilots are qualified on MIG21’s. Then there’s the problem of no radar.
The Ukrainian air force has aircraft but they are grounded because the Russians took out their radar and blew up their fuel depots days 1-2.
Even jumping from the Uke MiG-29 to a Uke variant will take some time. People have no idea how much variation there is in the “same” plane when that plane has been made for 40 years. All the placards and labeling and gauges in Polish, Russian, or Ukrainian which nobody really actually used until 2014?
You don’t wanna be looking for a switch when you are busy.
All 737s look the same... from the outside. But you better believe there are differences.
Only nato/us has the technical ability to control the airspace over Ukraine. Giving fighter aircraft to them is useless. Even for us it would incur significant losses. The current generation of surface to air missiles is scary. Without sam suppression flying over there is a suicide mission.