Northeast Asian states have increasingly been alerted by transnational security issues such as arms proliferation, terrorism, organized crime, disease epidemics, and environmental degradation. While we have seen other regions developing multilateral security cooperation systems in different degrees to deal with those issues, Northeast Asia has not seen such a system yet. Meanwhile, President Park Geun-hye proposed the ‘Seoul Process’ to overcome the ‘Asian paradox’ in her speech to a joint session of the US Congress. In her speech, she envisioned building a multilateral security cooperation regime for peace and cooperation in Northeast Asia, much like the ‘Helsinki Process,’ which includes the US, Northeast Asian countries, and even North Korea. This session will discuss various ideas for regional security architecture in Northeast Asia.