United Nations Transitional Administration in East Timor in the context of "Peacekeeping"

Timor-Leste, also known as East Timor, officially the Democratic Republic of Timor-Leste, is a country in Southeast Asia. It comprises the eastern half of the island of Timor, the coastal exclave of Oecusse in the island's northwest, and the islands of Atauro and Jaco, for a total land area of 14,950 square kilometres (5,770 sq mi). Timor-Leste shares a land border with Indonesia to the west; Australia is the country's southern neighbour, across the Timor Sea. Dili, on the north coast of Timor, is its capital and largest city.

Timor was settled over time by various Papuan and Austronesian peoples, which created a diverse mix of cultures and languages linked to Southeast Asia and Melanesia. East Timor came under Portuguese influence in the sixteenth century, remaining a Portuguese colony until 1975. Internal conflict preceded a unilateral declaration of independence and an Indonesian invasion and annexation. The subsequent Indonesian occupation was characterised by extreme abuses of human rights, including torture and massacres, a series of events named the East Timor genocide. Resistance continued throughout Indonesian rule and in 1999, a United Nations–sponsored act of self-determination led Indonesia to relinquish control of the territory. On 20 May 2002, Timor-Leste became the first new sovereign state of the 21st century. That same year, relations with Indonesia were established and normalised, with Indonesia also supporting Timor-Leste's accession into ASEAN.

United Nations Administered East Timor refers to the period when between 25 October 1999 and 20 May 2002, Timor-Leste was governed by the United Nations Transitional Administration in East Timor as a United Nations administered territory.

United Nations Security Council resolution 1272 was adopted unanimously on 25 October 1999, after recalling previous resolutions on East Timor (Timor Leste), particularly resolutions 384 (1975), 389 (1976), 1236 (1999), 1246 (1999), 1262 (1999) and 1264 (1999). The council established the United Nations Transitional Administration in East Timor (UNTAET) that was responsible for the administration of the territory until its independence in 2002.