We must...be prepared for the possibility that events will require intensive high-level shuttle diplomacy. An escalation of tensions in the East China Sea, including the possibility of limited military clashes between Japan and China that might compel us to intervene on Japan’s behalf, depending on the circumstances, would be a serious setback and challenge to U.S. policy priorities. It warrants top-level strategy and attention if we are to prevent acute deterioration in the regional security environment.