In Syria, after seven years of civil war, the rise of ISIS and its not-quite defeat, minimalistic U.S. actions, multiple efforts by neighboring powers and Russia to finish the fight militarily, the war there is finally winding down. The costs have been horrendous - perhaps three-quarters of a million killed, more than five million refugees, and a country of more than 23 million people devastated.

Syria is more distant than Yugoslavia, and Europe has been slower to react. But the challenge to its interests is even greater. The humanitarian tragedy and the political impact of millions trying to reach the security of Europe have been deeply unsettling.

The efficacy of the EU has been roundly challenged, destructive nativist and nationalist sentiments have taken root, Turkey has become not a buffer for Europe but a problematic partner, and Russia has been given new opportunities to make mischief.

But British and French military action indicates political movement toward a solution is possible. It is probably too late for the West to pull off another Bosnia-like rescue with peacekeepers and NATO. And after failures in Iraq and prolonged efforts on Afghanistan, there is little will to do so.

But Syria must, ultimately be reconstructed, and there is the opportunity for Europe and perhaps the U.S. to redress the tragedy: reconstruction requires money, and this is Europe's great asset and leverage.