アジア・アフリカ会議
For the next 30 years, Prince Wan continued to serve his country in a number of important diplomatic missions, some of the notable milestones being negotiations with Japan in 1943 during World War II, representing Thailand at the Greater East Asia Conference, participation in the SEATO Council and the Bandung Conference, where he was elected rapporteur, and negotiations leading to Thailand's admission to the United Nations.