In a move that further escalated tension in the region, China’s announcement of an Air Defense Identification Zone (ADIZ) in the East China Sea, elicited strong protests from the United States, Japan, and South Korea. The Chinese ADIZ includes airspace over the Diaoyu/Senkaku Islands claimed by both China and Japan and requires that aircraft entering its ADIZ must report flight information to Chinese authorities, otherwise, “China’s armed forces will adopt defensive emergency measures to respond to aircraft that do not cooperate in the identification or refuse to follow the instructions.” These measures are clearly provocative, contrary to international practice, and increase the risk for clashes and collisions which could escalate into a larger and more serious conflict.