Anadyr, which lacks permanent road access, is reachable only by aircraft or limited seasonal maritime routes
Hmm.
I'm not sure that that's such a great idea from Russia's standpoint. Yes, Ukraine probably can't just do a repeat of what it did before, which was drive trucks through Russia loaded with drones. But the flip side is that Anadyr Airbase is a mile from the Pacific shore:
https://www.openstreetmap.org/way/75690390
If Russia has trouble intercepting Ukrainian USVs in the Black Sea, I'm skeptical that they'd be able to intercept USVs dropped off an innocent-looking cargo ship or something, and if those can launch UAVs, now you've got all your valuable eggs in one basket in an area that has a lot less buffer to defend. Probably doesn't even place Ukrainian special operators at risk the way the truck operation did. It's not that far off shipping traffic from Alaska to Asia:
I'd have put them somewhere remote and inland and put air defenses up there. US Minuteman silos are in the center of the landmass, away from oceans.