The Revolutionary Front for an Independent East Timor (Fretilin) resisted a Timorese Democratic Union (UDT) coup attempt in August 1975, and unilaterally declared independence on 28 November 1975. Fearing a communist state within the Indonesian archipelago, the Indonesian military launched an invasion of East Timor in December 1975. Indonesia declared East Timor its 27th province on 17 July 1976. The UN Security Council opposed the invasion and the territory's nominal status in the UN remained as "non-self-governing territory under Portuguese administration".