IP26075
Authors: Chaula Rininta Anindya, Adhi Priamarizki
Published: 02 July 2026
Indonesia and Japan have deepened their defence cooperation through a series of high-level meetings between their defence ministers, Shinjiro Koizumi and Sjafrie Sjamsoeddin. In May 2026, the two ministers signed a Defence Cooperation Arrangement (DCA), marking a significant milestone in bilateral security ties. The following month, Koizumi made a brief – less than 24-hour – visit to Indonesia to meet President Prabowo Subianto in person, signalling Tokyo’s intent to accelerate the agreement’s implementation. This paper traces the trajectory of Indonesia-Japan defence cooperation and examines its implications for regional security.
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The article was published by RSIS.
The Romanian Institute for Europe-Asia Studies (IRSEA) and S. Rajaratnam School of International Studies (RSIS), NTU have agreed to enter into an informal agreement on republishing their studies and analysis.
The opinions expressed in this article are the author’s own and do not necessarily reflect the official policy, position or view of IRSEA.