Preventive Diplomacy (PD) has been recognized as a useful tool to address security issues in the Asia-Pacific region. To explore a PD mode compatible with the regional situation step by step on the basis of consensus has become the common will of the regional countries. Since the region is facing various new challenges, this requires innovation in theories and practices of PD. Focusing on the practice of preventive diplomacy, this book conducts empirical and comparative studies on the application of preventive diplomacy in various issue areas and by different countries.