All the commentary I read from reputable media seem to boil down to "Putin did it because that is the sort of thing that Putin does", without providing any further analysis on why it would make strategic or tactical sense for Putin to do so.
The more serious journals such as Foreign Policy seem to have ignored the issue entirely as far as I can see.
I think this video is articulate and sensible: https://www.youtube.com/watch?v=hk-0qJXyido