Couple of other thoughts. I question what Russia's operational reserves of money and munitions, look like to sustain this level of conflict. Modern cruise and intermediate range missiles are expensive and can't be stamped out of a reloading press. I have no access to numbers, but assuming the count of 150-200 launches is correct, I would not be surprised if Russian operational forces haven't expended three-quarters of those available. They probably have a bunch of Scuds, Frogs, and their ilk in storage somewhere, but they would be lucky to hit Kiev with them, much less a specific target.
Fighters and attack helicopters are difficult to maintain. In combat operations, they devour parts, fuel, and man hours at incredible rates. I suspect their availability rates are already collapsing. Plus as we saw last night, the Ukrainians are still able to engage low flying aircraft (probably with Stingers).
Assuming Putin was counting on 3-4 day decapitation exercise with a week of clean-up, the mathematics may suddenly be starting to look unsustainable. Not counting replacement costs, an operation of this size and complexity has to be running what? 1 - 1.5 billion a day? How long can Putin and Russia sustain that level of expenditure before the pragmatists step in?