[yucky]

The Donbas isn't really the main target for Russia, since that is already essentially ruled by separatist pro-Russian forces for years. The prize is the area west of there and to the south, connecting Crimea by land and freeing up the water resources that have been blocked.

Admittedly I'm not a historian like the Twitter guy with the bad analogies, but I suspect the furthest west that Russia seeks to control is Kherson (not Odessa), then following the water going back NE of there to Zaporizhzhia & then all the way up towards Kharkiv in some fashion. This gives Russia a ton of natural[1] and industrial resources, plus significantly weakens Ukraine, without having to try and occupy the more populated and less Russian areas west of there towards Kyiv and further. Putin will likely try to sell this as necessary to provide a buffer zone for the heavily Russian Donbas region from Ukrainian shelling.

That being said, I'm just some turd on the internet so I'm probably wrong and nobody knows for sure what Putin's long term plan is.

[1] https://w7.pngwing.com/pngs/864/537/png-transparent-ukraine-...