Deep Dive: Indonesia and Australia to expand security cooperation including Japan and Papua New Guinea

Indonesia and Australia are deepening their bilateral security partnership by incorporating Japan and Papua New Guinea, reflecting a strategic response to evolving dynamics in the Indo-Pacific. Historically, Indonesia and Australia have navigated complex relations due to issues like West Papuan independence movements and maritime border disputes, but post-Cold War engagements have emphasized mutual interests in countering non-traditional threats such as piracy and illegal fishing. Japan, as a major economic power with growing defense capabilities under its reinterpretation of Article 9, seeks to bolster alliances beyond the US framework to secure vital sea lanes for energy imports. Papua New Guinea, sharing borders with Indonesia, brings in concerns over border security and resource-rich terrains vulnerable to transnational crime. From a geopolitical lens, this quadrilateral arrangement signals a hedging strategy against China's assertive presence in the South China Sea and surrounding waters, without explicitly naming Beijing, preserving diplomatic nuance. Key actors include Indonesian President Joko Widodo's administration prioritizing 'active' foreign policy, Australia's Labor government under Albanese pivoting to regional multilateralism post-AUKUS, Japan's Kishida administration expanding security roles, and PNG's Marape government balancing ties with multiple powers. Culturally, Indonesia's Pancasila-based non-alignment contrasts with Australia's ANZUS commitments, yet shared archipelagic geography fosters pragmatic cooperation. Cross-border implications extend to enhanced maritime patrols, joint exercises, and intelligence sharing, affecting global trade routes like the Torres Strait and Lombok Strait. Stakeholders beyond the immediate region, such as the United States via QUAD and ASEAN members, stand to benefit from stabilized flanks, while potential friction with China could ripple into economic domains. The outlook suggests incremental institutionalization, possibly evolving into formal minilaterals, amid rising tensions over Taiwan and the Pacific Islands.