This damned thing in the Balkans is still ongoing.
Serbia is sending troops to the border and has now put it's forces on the highest level of alert.
https://www.thedefensepost.com/2022/12/26/serbia-alert-kosovo-tensions/
I feel it may go poorly for the Serbs if it comes to war, their benefactor is predisposed at the moment and the west really does not care if it angers said benefactor either. A war in the region right now might even be good for Nato, they should be able to squash Serbia.
There is more talk of a Russian thrust from Belarus again as well. It's possible, if they have the forces to spare then I see no reason why they should not, it would divert Ukrainian forces at least. But I don't know if they can spare the troops.