Ah, Feb 2018 Russian AF in Syria lost Frogfoot and its pilot, Maj Phillipov, former Ukranian AF officer who joined Russian AF after Crimean Anshluss, ejected safely but been KIA before any CSAR efforts had been ever made. That aircraft fired rockets by CAS request from evidently Russian FAC on the land and evidently didn't await any AA enroute but some ISIS MANPADS crew was on its place. Short close combat resulted in that this guy, empty with ammo after several minutes, blown himself and a couple of insurgents up with a hand grenade.
Dunno who's wrong and who's right there, but that case is a manifestation: no matter how good the CSAR assets in area are, they would simply be out of time to react since there can be less than a minute between ejection of a Sandy pilot and his firearms contact on the land.
I.e. CSAR as such unfolds beyond purely aerial CSAR, something has to be done by land forces already there. So, there should be some land forces everywhere, in one or another kind.