In 1974, the neighbouring colony of Portuguese Timor descended into civil war after the withdrawal of Portuguese authority following the Carnation Revolution, whereby the left-wing populist Fretilin ("Frente Revolucionária de Timor-Leste Independente") emerged triumphant. With approval from Western countries (including from U.S. president Gerald Ford and Australian prime minister Gough Whitlam during their visits to Indonesia), Suharto decided to intervene claiming to prevent the establishment of a communist state. After an unsuccessful attempt of covert support to Timorese groups UDT and APODETI, Suharto authorised a full-scale invasion of the colony on 7 December 1975 followed with its official annexation as Indonesia's 27th province of East Timor in July 1976. The "encirclement and annihilation" campaigns of 1977–1979 broke the back of Fretilin control over the hinterlands, although continuing guerrilla resistance caused the government to maintain a strong military force in the half-island until 1999. An estimated minimum of 90,800 and maximum of 213,600 conflict-related deaths occurred in East Timor during Indonesian rule (1974–1999); namely, 17,600–19,600 killings and 73,200 to 194,000 'excess' deaths from hunger and illness, although Indonesian forces were responsible for about 70% of the violent killings. Indonesia's invasion and occupation of East Timor during Suharto's presidency resulted in at least 100,000 deaths.