Since China first surpassed Japan in 2010 to become the world's second largest economy,the continuing friction and tensions between China and Japan has intensified around issues such as the Diaoyu Islands and the East China Sea air defense identification zone.At the end of 2013,with Japanese Prime Minister Shinzo Abe's visit to the Yasukuni Shrine,the Sino-Japanese relationship was brought to the lowest point in nearly 30 years.What are the deep-seated reasons for this? What are Japan's strategic intentions? These questions are worthy of further exploration.