Non-member observer states are recognized as sovereign entities, and are free to submit a petition to join as a full member at their discretion. For example, Switzerland was also a permanent observer state from 1948 to 2002, until becoming a full member on 10 September2002. Currently, the only such state, the Holy See, is described [1] as a "Non-member State having received a standing invitation to participate as observer in the sessions and the work of the General Assembly and maintaining permanent observer mission at Headquarters".
6 April1964: became a permanent observer state 1 July2004 (A/RES/58/314): gained all the rights of full membership except voting
Notes
The Republic of China, or Taiwan, in addition to applying for full membership, has also applied variously for non-member or observer status in the UN since 1991. Such requests have been consistently denied due to the UN's recognition of the People's Republic of China as the successor to the Republic of China, with sovereignty over all of China, including Taiwan; this resulted in the 1971 replacement of the Republic of China with the People's Republic as the official representative of China.
Palestine and the Sovereign Military Order of Malta are currently not recognized by the United Nations as non-member states, but only as entities (see next section).
International organizations and entities
Many international organizations, non-governmental organizations, and entities whose statehood or sovereignty are not precisely defined, are invited to become observers at the General Assembly. Some of them maintain a permanent office in the United Nations headquarters in New York City, while others do not; however, this is the choice of the organization and do not imply differences in their status.
November 22, 1974 (A/RES/3237 (XXIX)): observer status December 9, 1988 (A/RES/43/160): designation "Palestine" December 15, 1988 (A/RES/43/177): right to circulate communications without intermediary July 7, 1998 (A/RES/52/250): right to participate in general debate and additional rights