For more than a decade, the very idea of multilateralism often seemed to be on life support — damaged by the Iraq invasion and its messy aftermath, buffeted by the global economic crisis and bruised by the difficulty of coming to agreement on critical trade and climate issues in Doha and Rio, respectively. Now, the world’s attention is riveted on whether the United States and Russia’s agreement to avert the immediate crisis triggered by the use of chemical weapons in Syria can be effectively overseen by the United Nations Security Council.