Japan’s Defense Minister Shinjiro Koizumi is due in Jakarta on 10 September 2026 to meet Sjafrie Sjamsoeddin. The author (Simon Hutagalung) frames it as middle-power hedging: more maritime capacity against Chinese activity in the South and East China Seas without a bloc that undercuts ASEAN or strategic autonomy.

Jakarta does not claim SCS features but objects to Chinese “unauthorized presence” in the Natuna EEZ; Tokyo needs the same sea lanes and faces China over the Senkakus. ASEAN consensus has not stopped EEZ incursions. Expected asks: Japanese ships (Asagiri destroyers, Mogami frigates), maritime awareness, and—under a 2026 Defense Cooperation Arrangement—joint naval drills and intel sharing. Past cooperation was mostly HADR (e.g. 2015 fires).

Next layer: possible minilateral work with Australia and India. Constraints are Chinese economic weight in Indonesia, slow procurement, and Jakarta’s non-alignment habit. The hoped-for model is flexible, multi-layered security—not romantic neutrality and not great-power alignment. Sources cited: ISEAS (August 2026) and Japan Times on Japan–Indonesia–Australia talks (26 August 2026).

Japan’s Defense Minister Shinjiro Koizumi is expected to pay a working visit to Jakarta on September 10, 2026. Now more than ever, bilateral defense cooperation between Tokyo and Jakarta will help both countries tackle growing challenges posed by increasing Chinese activism in the South China Sea while they seek to maintain a Third Way of engagement with Beijing and persevere with their Security and Foreign Policy strategies. A key test case for emerging middle powers in the region, Japan and Indonesia are working to boost their respective defense preparedness and enhance their maritime security while ensuring that they maintain........

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