The so-called “China problem” is not merely regional in scope but extends to global issues such as human rights and security. The more China is integrated into an increasingly interdependent global community, the more important the “China problem” will become. On the other hand, the peaceful evolution of democracy in Taiwan deserves international attention, and its “pragmatic diplomacy” cannot be ignored by the world community. The American and Japanese responses to the China-Taiwan problem have featured both similar and different points. Nevertheless, the United States and Japan do face common regional and global issues related to China and Taiwan such as nuclear non-proliferation, arms control, and multilateral security arrangements. Thus, the China-Taiwan problems should be .discussed in the context of U.S.-Japan leadership sharing.