I am thinking of a conflict very similar to the Russo- Ukrainian war. Maybe:
- Ceausescu's culture destroying "renovation" plans get even more focused on ethnic Hungarian towns. There is a flash point at a historic church slated to be demolished to make room for a workers educational center.
- A Hungarian mob, including some people armed with hunting weapons, and more ominously for the Regime, also including some local police men sympathetic the cause drives the construction crew out and seizes control of the village. Two pro Regime ethnic Romanian police officers are killed while surveilling the village. C's response is slow as his power is waning. The unrest spreads to other towns and villages. Infrastructure is seized and road blocks established.
- Though most militants are locals, there are reports of Hungarian volunteers- some armed with military weapons crossing the border. The militants have mixed demands. Some want unification with Hungary proper, others want local autonomy and all want C gone.
- Some militants tend to equate ethnic Romanians and being pro C and the rapidly escalating conflict takes an ethnic turn. C rounds up all his reliable military and police units (ironically, the anti-Romanian spins shown by some of the militants allows C to find reliable units). C also arms ethnic Romanian civilians in the area.
-Several armored columns move towards the separatist areas. Fighting breaks out and discipline in some Romanian units breaks down. The pacification mission operation takes on an anti-Hungarian ethnic / cultural cleansing spin with some units. Civilian militias also have anti Hungarian spins.
- The Hungarian military says that it will not allow ethnic cleansing of Hungarians in the area, nor will it permit cultural cleansing via "renovation". C gets pressured by Moscow. Promises to reign in his security units- though he has little control over some. Also promises to end the pacification mission ASAP- well, once central govt control is re-established. No compromise, however, is possible on "renovation" plans. In fact, they are accelerated.
- The Hungarian Army crosses the border and direct clashes occur with Romanian units. Militias on both sides spiral out of control. Things are getting ugly fast…. .