This research mainly focuses on organizing the interaction between Korea and ASEAN since the 21st century, thinking over how Korea and
ASEAN adjusted their diplomatic policies and roles while the East Asian region is capricious, and cooperated with each other substantially, with the ASEAN-Korea Commemorative Summit 2009 as an example, exploring the interactive characteristics between Korea and ASEAN and the possible trends in the future.
The result shows that the diplomatic policies of Korea and ASEAN are getting more diversified in order to cope with the rapid integrated trend within the East Asia region. Both of them have started exploring the opportunities for cooperation, and the homogeneity between small and medium countries is favorable for such cooperation. Constrained by geographical factors and countries'' conditions, Korea and ASEAN mainly cooperated in the economic sector, with the method based on the multilateral cooperation of 「ASEAN + 3」, which was enhanced by the relationship of 「ASEAN + 1」(ASEAN +KOREA) and developed continuously via the process of creating ideal issues. Furthermore, in order to master the trend of the regional integration and take initiative in the integration process, Korea actively established the relationship with ASEAN, converged both 2 parties’ external negotiation ability, enhancing the influence in East Asia international system. Since economic and trade development is the strongest power that drives the current East Asia region’s integration process, and is also the core of Korea and ASEAN’s cooperation, whether the 2 parties could cooperate in the terms of regional issues in this way needs to be observed.
Restricted by the international political environment, Korea and ASEAN will keep cooperating in the way of bilateral and multilateral-cooperation, under the extension of the diplomatic strategies towards China and Japan.