> Where are the F-16s going to take off from (they need pristine runways)?
Probably relatively far from the action.
> Who will maintain them?
Ukrainians its one of the reasons why its taking so long for them to get them.
> How will they refuel without airtankers (they don't have enough range to make it to Donbas and back).
They don't have to fight at the front line, they can be used effectively as missile trucks to throw long range weapons like Storm Shadow and other long range weapons at Russian lines.
If a SU25 and Mig29 can survive doing that a F-16 will have no problem.
> How will they avoid the R37M (300km range) when the AMRAAM is not even 200km? And what about Russian SAMs and EW?
The same way that the SU25 and Mig29 do, the F-16 will survive much better.
Where are the F-16s going to take off from (they need pristine runways)? Who will maintain them? How will they refuel without airtankers (they don't have enough range to make it to Donbas and back). How will they avoid the R37M (300km range) when the AMRAAM is not even 200km? And what about Russian SAMs and EW?