The West does indeed face a high risk of becoming overstretched. But what is the alternative, other than accelerating chaos, mushrooming security risks and serial humanitarian disasters? For the West, this dilemma cannot be avoided. Today's accumulating crises, accompanied by America's strategic fatigue, are forcing Europe to define what role it will play in the future of Western -- and global -- stability. If the U.S. can no longer bear the burden of Pax Americana, Europe must do more for collective security.