That China has been politically and economically playing an important role in the world has great impact to regions all over the world, especially in East Asia. After the Cold War, Japan has gradually walked out of its past "one nation pacifism," actively participating in the international affairs under frameworks of "U.S.-Japan alliance" and the U.N. It is to fulfill its dream of becoming a "political great power." Therefore, Japan has also been playing an important role in the regional issues. On November 2002, North Korea decided to reactivate its uranium-enriching program. It has raised the tension in the region of East Asia; it has also disturbed international relations in the region. The U.S. expects China and Japan, two great powers in the Northeast Asia, intervene in the North Korea problem, hoping to solve the problem with multi-literal agreement. Can the North Korea nuclear crisis shorten the diplomatic distance between China and Japan, establishing the "military strategic partnership," or showing the radical paradox between the two countries? Examining interactions between China and Japan in the North Korea nuclear crisis can clarify the thinking of two countries' regional strategies and benefits of competition and cooperation in politic, security, and economy. [ABSTRACT FROM AUTHOR]