1945-08-17
Indonesia Declares Independence
Indonesia proclaims independence from Dutch colonial rule. East Timor remains under Portuguese control, setting stage for future territorial disputes in the region.
1975-11-28
East Timor Independence Declaration
East Timor declares independence from Portugal under FRETILIN leadership. Indonesia views this as a threat and begins military preparations for integration.
1975-12-07
Indonesia Military Invasion Begins
Indonesian armed forces invade East Timor with approximately 10,000 troops. This marks the beginning of a 24-year occupation resulting in estimated 100,000+ deaths.
1976-07-17
Indonesia Annexes East Timor
Indonesia formally integrates East Timor as the 27th province, creating international legal dispute. Most nations and UN do not recognize the annexation.
1999-08-30
Independence Referendum Held
UN-sponsored ballot results in 78.5% vote for independence from Indonesia. Referendum is followed by violence from pro-integration militias supported by Indonesian military.
1999-09-20
INTERFET Peacekeeping Begins
International Force for East Timor (INTERFET) led by Australia arrives to restore order and prevent humanitarian catastrophe following independence vote violence.
2002-05-20
East Timor Full Independence
Timor-Leste officially becomes independent nation; UN transfers authority and INTERFET withdraws. Indonesia-East Timor tensions ease but maritime boundary disputes remain unresolved.
2002-11-20
Indonesia-Timor-Leste Border Treaty
Nations sign maritime boundary agreement establishing EEZ and continental shelf limits. However, major areas of dispute remain, particularly regarding oil and gas reserves.
2006-05-28
Internal Timor-Leste Crisis Erupts
Military mutiny and communal violence destabilize Timor-Leste; Indonesian troops briefly re-enter. International peacekeepers return but border tensions remain elevated.
2018-12-15
Maritime Boundary Delimitation Treaty
Indonesia and Timor-Leste sign treaty establishing maritime boundaries and joint development zones. Australia involved in negotiations as interested party in regional resources.