For further clarification this is NOT a war to stop NATO expansion as Ukraine was no where near that and it could have been stopped diplomatically. This is a war started by a dictator who has aims to restore the USSR before he kills over or is deposed in the next 10 to 15 years. This war is about nothing more than Putin's ego. Just for clarification.
The last thing Putin needs is another quagmire like Afghanistan in the 80s for the USSR, and the 2000s/2010s for the US.
If anything he'd probably like to see Luhansk and Donetsk become globally recognized independent states. Ukraine is certainly strategic. Russia has recently INCREASED gas supplies through Ukraine even though they are at war.
The idea that he's a madman looking to get the old commie band back together is kind of far-fetched. This is about money and influence, and specifically Nordstream2, which I imagine will go online sooner rather than later.