It could get really nasty, really fast. The timing seems a bit contrived—Ukraine attack and Wagner revolt? Like their was some co-operation?
Possible scenario. Ukraine intel contacts Wagner group and lets them know that if they revolt successfully and take over the government in Russia that Ukraine will recognize them immediately. Maybe some sort of deal where the Russians withdraw to 2012 borders and Ukraine will not press for reparations, preferring to have the west do a Marshall plan for Ukraine. In exchange, Ukraine becomes NATO and Russia accepts this.