I think the burning memory of Yugoslavia is sufficiently potent that the EU (or a coalition of the military powers therein) would intervene militarily in anything which started degenerating into serious armed conflict.

If it isn't, then I'm afraid it will be up to us (EU civil society) to bring it back into the collective memory. Yes, us : antimilitarists, bordering on pacifism, we will campaign for war if necessary. I think, in the absence of any European body competent in military matters, that one or more EU nations would formulate a proposition of intervention, and others would be shamed into joining it.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}