This book analyzes the cost of division that the four powers must bear as well as the benefits of nification they will acquire. There has been much research on the same topic, but mostly done from the perspective of Korean scholars. However, this book provides perspectives of scholars from each of the four states as well as Asia-Pacific region. This book is part of an ongoing effort by KINU to strengthen South Korea’s unification diplomacy. This book is divided into 10 chapters. Chapter 1-8 analyze the cost of division and the benefits of unification from the security and economic perspective of the United States, Japan, China, and Russia. Chapter 9 and 10 look at the bigger picture by discussing the division cost and benefits of unification from the standpoint of the Asia-Pacific region as a whole. Based on the analyses of the chapters, the conclusion chapter examines the similarities and differences of the division cost that the four powers must bear as well as the benefits they will obtain. Introduction The Costs of Division and the Benefits of Unification for the Four Northeast Asian Powers/ Kook-Shin Kim, Jae-Jeok Park Chapter 1 The Costs of Korean Division and the Benefits of Korean Unification for U.S. National Security/ Kongdan Katy Oh Chapter 2 Economic Implications for the United States of the Divided Korean Peninsula/ William B. Brown Chapter 3 Korean Peninsula Division/Unification and China : From the Security Perspective of China/ Ming Liu Chapter 4 Korean Peninsula Division/Unification and China : From the Economic Perspective of China/ Jiyoung Zheng,Jianzhong Jiang Chapter 5 Korean Peninsula Division/Unification : From the Security Perspective of Japan/ Tomohiko Satake Chapter 6 Costs and Benefits of Korean Unification for Japan : Political and Economic Perspectives/ Sachio Nakato Chapter 7 Korean Peninsula Division/Unification and Russia : From the Security Perspective of Russia/ Leonid Petrov Chapter 8 Korean Peninsula Division/Unification and Russia : From the Economic Perspective of Russia/ Alexander Fedorovskiy Chapter 9 Korean Peninsula Division/Unification and Security Order in the Asia-Pacific Region/ Thomas S. Wilkins Chapter 10 Korean Peninsula Unification : Opportunities and Challenges to Asia-Pacific Economies/ Jeffrey Robertson