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Abstract
This study analyzes the influence of Prabowo Subianto's idiosyncratic characteristics on the formulation of Indonesia's Optimum Essential Force (OEF) 2025 defense policy. Despite growing scholarly interest in Indonesian defense modernization, existing literature predominantly emphasizes structural and institutional explanations while under examining the role of individual leadership. Drawing on Foreign Policy Analysis, this study employs Leadership Trait Analysis (LTA) based on Hermann's framework and process tracing to construct and verify causal chains between Prabowo's personal characteristics and specific OEF 2025 policy decisions. Analysis of spontaneous public statements identifies four dominant traits: high need for power, high belief in ability to control events, high self-confidence, and high ingroup bias combined with medium-high distrust of others. Process tracing demonstrates that these traits causally contributed to the centralization of acquisition decision-making, the mandatory inclusion of technology transfer clauses, the ambitious defense budget targets, and platform preferences reflecting limited power-projection ambitions. The findings indicate that the qualitative shift from the Minimum Essential Force to OEF 2025 cannot be explained by regional structural pressures alone; within this case, the idiosyncratic variable functions as a necessary component of the explanation. The study contributes the first systematic individual-level account of Indonesian defense policymaking and illustrates the analytical value of leadership variables in explaining departures from established policy trajectories.
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Copyright (c) 2026 Muhammad Zhafran Abiyyu, Shabrina Khalisah Ibrahim

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
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References
SIPRI M. Military expenditure database 2019.
Firepower G. Military strength ranking. URL: Https://Www Globalfirepower Com/Countries-Listing Php 2020.
Anwar DF. The Many Facets of Prabowo Subianto: Quo Vadis Indonesia’s Foreign Policy? Asia Policy 2024;19:108–16. https://doi.org/ 10.1353/asp.2024.a942837.
Setiawan A. Politik Luar Negeri Indonesia di Bawah Pemerintahan Prabowo Subianto: Dari Pragmatisme Ekonomi menuju Strategic Assertiveness dalam Tatanan Multipolar (2024-2025), 2025.
Wardhani B, Dugis V. Indonesian foreign policy under the Jokowi administration: Variations on traditional ideas. Issues & Studies 2023;59:2350005. https://doi.org/10.1142/S1013251123500054.
Rosenau JN. Pre-theories and theories of foreign policy. Approaches to Comparative and International Politics 1966;27.
Hudson VM. Foreign policy analysis: Actor-specific theory and the ground of international relations. Foreign Policy Analysis 2005:1–30.
Hermann MG. Explaining foreign policy behavior using the personal characteristics of political leaders. International Studies Quarterly 1980:7–46.
Sitepu QFB. From Stability to Power Projection: An Analysis of Indonesia’s Shifting Foreign Policy Orientation during the Reigns of Joko Widodo and Prabowo Subianto n.d. https://doi.org/10.31947/hjirs.v5i2.45523.
Batubara ST, Rosyidin M, Hanura M. Pengaruh Idiosinkratik Justin Trudeau dalam Kebijakan Luar Negeri Kanada: Studi Kasus Penerimaan Pengungsi Suriah: Studi Kasus Penerimaan Pengungsi Suriah. Intermestic: Journal of International Studies 2021;6:172–96. https://doi.org/10.24198/intermestic.v6n1.9.
Zahra RAA. Analisis Ideosinkratik Joe Biden terkait Penangguhan Kebijakan AS" Zero Tolerance". Journal of Integrative International Relations 2024;9:45–59. https://doi.org/10.15642/jiir.2024.9.1.45-59.
Dyson SB. Personality and foreign policy: Tony Blair’s Iraq decisions. Foreign Policy Analysis 2006;2:289–306. https://doi.org/10.1111/j.1743-8594.2006.00031.x.
Creswell JW, Poth CN. Qualitative inquiry and research design: Choosing among five approaches. Sage publications; 2016.
Beach D. Process tracing methods. Handbuch methoden der politikwissenschaft, Springer; 2020, p. 699–719. https://doi.org/10.1007/978-3-658-16936-7_43.
Mietzner M. Jokowi’s Pyrrhic Victory. Contemporary Southeast Asia 2024;46:187–215.
Hermann MG. Assessing leadership style: A trait analysis. Social Science Automation. Inc Www Socialscienceautomation Com 1999.
Fouquet S, Brummer K. Profiling the personality of populist foreign policy makers: A leadership trait analysis. Journal of International Relations and Development 2023;26:1–29. https://doi.org/10.1057/s41268-022-00270-2.
Haripin M, Priamarizki A, Nugroho SS. Quasi-civilian defence minister and civilian authority: The case study of Indonesia’s Ministry of Defence during Joko Widodo’s presidency. Asian Journal of Comparative Politics 2023;8:164–83. https://doi.org/10.1177/20578911221141016.
Mietzner M. Democracy and Military Oversight in Crisis: The Failed Civilianisation of Indonesia’s Ministry of Defence. Journal of Asian Security and International Affairs 2023;10:7–23. https://doi.org/10.1177/23477970231152014.
Laksmana EA. Is Indonesia Sleepwalking into Strategic Alignment with China? Survival 2025;67:61–7. https://doi.org/10.1080/00396338.2025.2459017.
Aspinall E. Oligarchic populism: Prabowo Subianto’s challenge to Indonesian democracy. Indonesia 2015:1–28.
Gammon L. Prabowo’s Hegemonic Presidency and Its Discontents. Bulletin of Indonesian Economic Studies 2025;61:333–56. https://doi.org/10.1080/00074918.2025.2588820.
Rosyidin M, Kusumawardhana I. Major Power Wannabe: Military Modernization, Status Signaling, and Indonesia’s Foreign Policy under Yudhoyono and Widodo. Journal of Global Security Studies 2025;10:ogaf023. https://doi.org/10.1093/jogss/ogaf023.
Sulaiman Y. The Implications of Prabowo Subianto’s Presidential Win for Indonesia’s Security Policy. Asia Policy 2024;19:130–40. https://doi.org/ 10.1353/asp.2024.a942839.