1945-08-17
Indonesian Independence Declared
Indonesia declares independence from Dutch colonial rule, claiming all former Dutch East Indies territories including East Timor as part of its sovereignty.
1974-12-07
Indonesian Military Invasion
Indonesia launches Operation Seroja, invading East Timor with military forces to prevent it from becoming independent under leftist leadership after Portugal's decolonization.
1975-07-17
East Timor Integration Announced
Indonesia officially incorporates East Timor as its 27th province following military occupation, claiming full sovereignty over the territory.
1999-08-30
UN Referendum on Independence
Under UN supervision, East Timorese vote overwhelmingly (78%) for independence from Indonesia, triggering violent militia attacks and international intervention.
1999-09-20
International Force Deployed
INTERFET (International Force for East Timor) led by Australia lands to restore order and protect civilians after post-referendum violence kills thousands.
2002-05-20
East Timor Independence Recognized
Timor-Leste officially becomes independent nation; Indonesia recognizes sovereignty, ending 24-year occupation and resolving primary territorial dispute.
2006-03-19
Maritime Boundary Dispute Emerges
Disagreements arise between Australia and Timor-Leste over maritime boundaries in the Timor Sea containing valuable oil and gas reserves.
2018-12-23
Maritime Treaty Finalized
Australia and Timor-Leste sign maritime boundary treaty establishing Greater Sunrise development zone, partially resolving decades-long maritime resource dispute.
2023-01-09
Indonesia Ratifies Land Border
Indonesia and Timor-Leste finalize land border demarcation agreement, formally establishing 228-kilometer boundary and resolving remaining terrestrial sovereignty questions.