I really think people are over analyzing every move Russia is making. They went in unprepared and now they are stuck with a war they don't really want to fight.Frankly,. I stope long time ago to figure out the strategy of the Russians.
The Ukrainan side is easy and transparent like the thin air, but the Russian side looks like analysing a women behaviour - when you feel you get hold on it is the time to have a huge shock.
Yeah you could say the Ukrainians won't be able to forcibly eject them, but if they continue to get support from the West there's not really much Russia can do about ending the War, seeing as even 23rd Feb lines are unacceptable to the Ukrainians now and would be equally if not more so for the Russians after so much resources have been spent.
Mobilization doesn't seem to be on the table either, they still want to use those stopgap measures of recruiting a few hundred prisoners rather than the tens of thousands of troops they need to wage a successful campaign.
Military losses are temporary, but the prestige loss from this whole affair is very real. Already ex-soviets states are taking advantage of a weakened Russia to settle their grievances.