Co-chairing Asia-Pacific defence diplomacy: the case ASEAN Defence Ministers' Meeting Plus

This article assesses co-chairs' roles in affecting the outcomes of Asia-Pacific defence diplomacy, which have been under-examined. Attempting to mend this intellectual gap, our study examines: 'What shapes specific agreement details?' We contend that co-chairs' effectiveness is not borne out of resource possession but in fact derived from their ability to manage the resources. In order to be effective, co-chairpersons must convert the available resources at hands into bargaining leverage. To validate our argument, empirical analysis of military medicine (MM) collaboration under the ASEAN Defence Ministers' Meeting Plus (ADMM-Plus) framework was conducted. We demonstrate how the Thai and Russian co-chairs altered the bargaining dynamics to shape the outcomes regarding the ASEAN Center of Military Medicine (ACMM). Insights from our analysis not only extends the existing academic literature on Asia-Pacific defence diplomacy and international negotiation, but also provides practitioners with lessons useful for conducting defence diplomacy and enhancing security cooperation in the Asia-Pacific and beyond.