International Crisis Group : Armenia and Azerbaijan:

"Escalating front-line clashes, a spiralling arms race, vitriolic rhetoric and a virtual breakdown in peace talks increase the chance Armenia and Azerbaijan will go back to war over Nagorno-Karabakh, with devastating regional consequences." -> in my own view this is the conflict whose renewed outbreak is easiest to predict for the next couple of years; I hope the international community will actually do something to try and prevent it.