I mean, they’ve gotten way better at it, but most of their equipment and doctrine are still targeted at utterly destroying a near peer level threat. The f-22 wasn’t designed to fight insurgents, nor is it suited to that task.
I would think that the USAF would happily establish and easily enforce a no fly zone over Ukraine and could probably pull it off within a few days of getting the order conservatively.
There was the story a few years ago when a well equipped and trained Wagner battalion “accidentally” picked a flight with a US army unit or base in Syria and got immediately demolished.
Writing this out definitely feels like braggadocio and it likely is. But I would think the Russians don’t want to find out why we don’t have universal healthcare first hand.