CO, I agree with your assessment of our DOS, but I just don’t see those stations in any way improving on GLONASS accuracy; its already able to thread needles, so to speak.
Perhaps they have another purpose, in the event that GLONASS is KO’d?
That's my guess.
More to the point, if we ever actually believed those sites posed a menace we could wipe them out quick.
What might be harder to catch would be clandestine radio beacons that nobody could tell from a ham radio installation.
Also, GPS might not even be the best way for guiding an ICBM or smartbomb. I don’t want to mention the other ways (who needs to tell their potential enemy how to arm) but anyone with a modicum of imagination could know.