Association of Southeast Asian Nations
Originally there were only five members of the ASEAN. Brunei Darussalam joined the ASEAN on 7 January 1984. Vietnam joined the ASEAN on 28 July 1995. Laos and Myanmar joined the ASEAN on 23 July 1997. Cambodia became a member on 30th April 1999. East Timor is the only Southeast Asian country that is not a member of ASEAN. However both East Timor and Papua New Guinea (which is not considered geographically a part of Southeast Asia) are observers of ASEAN and wish to become full members of ASEAN.