Indo-Pacific Studies Center · Alliance architecture
Who sits at the table
Eight treaty alliances and twelve security, forum and cooperation arrangements across 34 states and organisations. Select a state to trace its commitments, or an arrangement to see who is in it.
Abbreviations: FPDA Five Power Defence Arrangements · MSP Malacca Straits Patrol · TCA Trilateral Cooperative Arrangement · EAS/ADMM+ East Asia Summit / ADMM-Plus · ARF ASEAN Regional Forum · APEC Asia-Pacific Economic Cooperation · LMC Lancang–Mekong Cooperation · AU–FR–IN Australia–France–India Trilateral Dialogue.
Treaty alliances are bilateral or trilateral treaties in force that carry a mutual-defence commitment. Not included: the Taiwan Relations Act (US domestic law, not a treaty); the Indonesia–Australia Treaty on Common Security (2026; consultative, no mutual-defence obligation); the Australia–Fiji agreement (2026; Fiji is outside the 34 actors shown).
Verification, November 2026. Changes from the IISS figure: Indonesia added to the ARF, which the figure omits; Timor-Leste added to ASEAN (admitted 26 October 2025) and to EAS/ADMM-Plus; the figure's "Trilateral Dialogue" identified as the Australia–France–India dialogue. Confirmed unchanged: FPDA, AUKUS, Quad, MSP, TCA, ASEAN+3, APEC, LMC. Timor-Leste is not yet shown in ASEAN+3, pending confirmation of its participation.
*France's membership reflects its Indo-Pacific overseas territories. The figure's separate Trilateral partnership entry is omitted because its membership could not be confirmed.
Source: Compiled by IPSC from official sources, verified November 2026. Selection of arrangements informed by IISS, Asia-Pacific Regional Security Assessment 2024.