After three decades of moving toward a single global market governed by the rules of the World Trade Organization, the international order has undergone a fundamental change. The United States and China are locked in a tariff war that at first seemed to be about the bilateral trade balance, but has turned out to be about much more. Until recently, one could find hope in the fact that, despite frequent exchanges of threats, the two countries were negotiating. Not anymore. - By Joschka Fischer.