The security agenda in Northeast Asia has already been shaped, while long-standing security dilemmas remain unresolved. The perennial security dilemmas include the presence of a foreign military base, the threat of nuclear confrontation, the protection of peaceful nuclear technology, and the problem of the lack of a clear mechanism for implementing arms control and disarmament processes. Northeast Asia needs concrete schemes not only for nuclear arms control, but also for information exchange, transparency in the development and proliferation of conventional weapons.