Association of South East Asian Nations (ASEAN)
History and Membership. ASEAN is a regional intergovernmental organization formed by the governments of Indonesia, Malaysia, the Philippines, Singapore and Thailand through the Bangkok Declaration which was signed by their foreign ministers on 8 Aug. 1967. Brunei joined in 1984, Vietnam in 1995, Laos and Myanmar in 1997 and Cambodia in 1999. Papua New Guinea also has observer status.