Maybe he will just mobilize additional troops to hold the ground he always intended to take in the first place. Winter is coming and if people remember correctly he waited until the ground was solid after the winter thaw to move forward going into Ukraine because the ground was too soft for the military equipment. Going into winter he may be doing a pull back into the area's he occupies now and sending in troops to hold those grounds, at least until the ground is frozen, than what I don't know. I envision a pull back but I don't envision him giving up the area's he initially went after. In the global partnership agreements he was granted the rehabilitation of Russian providences, in exchange for what I don't know and it doesn't state either whether those providences were in or outside Russia's borders, as Russia thinks those area's are more belonging to Russia than Ukraine because more Russians live there than Ukrainians.
RE: Russia faces catastrophic consequences for nuclear weapon use.