That's pretty much what was originally wanted. Some (including me) speculated that since this erupted into a full war, Russia was going to claim everything east of the Dnieper. There's something Russia could do in all of this which would make things really awkward for Ukraine, but I don't see them doing it due to external politics. That is demanding that the region north of the Azov sea becomes an independent nation too. This would make things really difficult politically for both the AZOV militia and the Ukrainian government.