Thumpalumpacus
Major
I can see the next Russian offensive bypassing the major cities in the east and advancing all the way to the Dnieper. The besieged cities will fight, of course but it will be a matter of time before ammo runs out and no western resupply, short of air-drops, will be possible.
That's if their logistics can support cross-country mobility. I've read articles reporting that the logistics issues extend behind the Russian frontier as well -- though that was a couple of weeks ago and who knows if the problem has been ironed out.