1975-12-07
Indonesian Military Invasion
Indonesia launches Operation Seroja, invading East Timor with 10,000 troops to prevent independence. The invasion follows Portugal's decolonization and Fretilin's declaration of independence.
1976-07-17
East Timor Integration Annexed
Indonesia formally incorporates East Timor as its 27th province, claiming it as part of the Indonesian archipelago. International community largely rejects the annexation.
1983-12-12
Santa Cruz Massacre
Indonesian military kills approximately 271 East Timorese civilians during a funeral procession in Dili. The incident becomes a major atrocity highlighting resistance to occupation.
1999-08-30
Independence Referendum Held
East Timorese vote 78.5% in favor of independence in UN-supervised referendum. Indonesia-backed militias launch violent campaign against independence supporters.
1999-09-15
International Force Intervention
UN-authorized International Force for East Timor (INTERFET) led by Australia arrives to restore order. Indonesian military and militias withdraw from territory.
2002-05-20
Timor-Leste Full Independence
Timor-Leste (East Timor) officially becomes independent nation. UN Transitional Administration ends; Indonesia formally recognizes sovereignty.
2003-05-20
Timor Sea Treaty Signed
Timor-Leste and Australia establish maritime boundary and agree to share Greater Sunrise gas field revenues 50-50. Indonesia excluded from maritime dispute resolution.
2006-05-28
Indonesian Border Clashes Erupt
Armed clashes occur along Indonesia-Timor-Leste border with militias and gangs crossing from West Timor. Destabilization campaign undermines Timor-Leste security.
2018-03-14
New Maritime Boundary Negotiations
Timor-Leste and Australia begin renegotiating maritime boundaries and resource-sharing arrangements. Dispute centers on maritime zones and continental shelf claims.
2023-12-06
Timor-Leste Files UNCLOS Case
Timor-Leste submits case to UN Commission on the Limits of Continental Shelf (CLCS) regarding maritime boundaries. Ongoing negotiations with Australia and potential Indonesian involvement.