Strikes me that there is no way this doesn't end in meltdown for the Russian economy. They are using munitions they cannot easily replace. They are losing airplanes by the dozen that cost tens of millions of dollars each that they cannot replace full stop. The 'special military operation' is a significant drain on their economy in itself. So their economy is under more strain than it normally would be at just the time the sanctions are ratcheted up against it.
In the meantime, the war has settled down (poor choice of phrase, I know) into a grim slog where the Russians make tiny advances and the Ukrainians sustain major structural damage whilst inflicting guerilla-like damage on the Russian military. It all ends in one of two ways in my opinion: either Ukraine collapses before the Russian economy does, and the Russians face an Afghanistan-style guerilla operation until their economy does grind to a complete halt, or the Russian economy collapses before the Ukrainians have fallen, leaving both countries in a desperate state.
What worries me is what Putin will do when that endgame is getting very near.