Any gains Russia makes in defeating our defenses and military advantages will remain, regardless of where or when they accomplish them.
A good reason not to continue the hostilities which excercise formerly dissused muscle, which our neocons in State/DOD/CIA do not seem to realize. Their stupidity led directly to the Russian development and deployment of the The deployment of the Iskander-M, the RS-28, the Status-6 strategic torpedo and the Kinzhal. Wunderwaffen? Maybe - I hope to never have an aswer to that question. So yes, I agree that an advantage gained remains.