Ukraine should not be restricted from flying the F16s over Russia. The planes carrying drones from Iran are legitimate targets. One or two AAMRAMs against them would save dozens of costly drone intercepts later. Sounds like Vietnam where Russian SAMs couldn’t be destroyed in the harbor and our pilots had to allow them to become operational.
There is a LOT of surveillance support from NATO countries flying missions near the relevant borders. Not over Russia or Belarus, of course, and not over Ukraine. YouTuber “Suchomimus” had a pretty illustrative vid on that a few days ago.
I’m still unsure how far out NATO can detect Russian aircraft or, say, S-300 launches.