Europe's First Real War in Decades

The separatist pantomime is over, and it is toward a new reality that we may be headed: the reality of the first real war in Europe in decades, the first aggression of one sovereign state against another that the former intends to dismember and reduce to vassal status—the very things that the construction of Europe, its reunification, and the end of the Cold War were supposed to have made impossible. 

In the face of a dizzying escalation that is gathering speed by the hour, what should we do?