In that capacity, he also served as chairman of the Human Security Network, established in 1999 as an association of countries working to promote the concept of human security as a feature of national and international public policy.
While foreign minister, Suphamongkhon enhanced Thailand's diplomatic role in the Association of Southeast Asian Nations (ASEAN), and in the world at large.
He advanced Thailand's constructive role in global affairs.
Among other things, Suphamongkhon, while in Pyongyang, encouraged the Democratic People's Republic of Korea (DPRK or North Korea) to enter and resume the Six-party talks.
He had been to the DPRK several times and has worked closely also with the then U.S.
Secretary of State Condoleezza Rice, the People's Republic of China's Foreign Minister Li Zhaoxing, and the Republic of Korea's Foreign Minister Ban Ki-moon, with the goal of maintaining peace and security on the Korean Peninsula.
Suphamongkhon is now the University of California Regents' Professor at the University of California, Los Angeles (UCLA) as well as Senior Fellow at the Burkle Center for International Relations at UCLA.