The final set of divergence is paradoxically perhaps the most successful part of bilateral relations – defence cooperation. Indonesia-Australia defence ties today are perhaps at their strongest in more than a decade. Despite occasional hiccups, the post-Lombok Treaty dynamic has grown from strength to strength, from personnel exchanges to major exercises and arms transfer. Indonesia and Australia are even upgrading their Defence Cooperation Arrangement.
The risk is that Australia wrongly interprets strong defence ties as meaning that its strategic outlook will converge with Indonesia’s. Some Australian officials may believe that Jakarta and Canberra view China in the same way, that the Five Power Defence Arrangement and the US military presence are seen as a net positive, or that the Indonesian defence establishment no longer hold grudges over the 1999 independence of East Timor. These are at best untested assumptions.
Defence ties rest heavily on education and training exchanges as well joint exercises, rather than arms sales or collaboration, let alone joint war-fighting or operational history. With such personnel-centric defence engagements, Australia seeks better understanding, closer ties, and presumably stronger influence within the Indonesian defence establishment.
Indonesia needs the engagement activities and programs to improve its own readiness and professionalism, especially given its under-resourced educational, exercise, and training infrastructure. In some cases, such as during the US military education embargo in the 1990s and 2000s, Indonesian defence officials also saw Australian programs as both a necessary stopgap and a way to back-channel some messages to the United States.
But in general, Indonesia-Australia defence ties are unproven. In the event of a war, say over Taiwan, is Australia expecting Indonesia to do nothing or even facilitate its assets including nuclear-powered subs to go through Indonesian waters on their way to the first island chain? What if China seeks to prevent that? If Papua becomes another East Timor-level fiasco, will Australia be ready to do nothing and support Indonesia no matter what?
Flushed with optimism, defence policymakers and analysts may have yet to seriously debate these questions. Not to mention the fact that the Indonesian military today is not as influential in strategic policymaking as it was during the New Order years under Suharto. Bottom line, defence ties cannot provide the strategic ballast many assume.