DuringthefourthroundoftheU.S.-ChinaStrategicandEconomicDialogue,atopChineseofficialbroughtuptheideaofaC2—Sino-U.S.cooperation.SuchagroupingwouldnotonlyhelptodevelopSino-U.S.ties,butitalsoreflectsChina’snewmoreassertiveroleinitsrelationswithbigpowers.