Military Diplomacy in a Multipolar World: Indonesia–Spain Strategic Defense Cooperation and Implications for Global Security

Abstract

This article examines how Indonesia’s military diplomacy—operationalized through its strategic defense cooperation with Spain—advances trust-building, interoperability, and capability development in a multipolar security environment. Drawing on recent policy windows and bilateral forums, including defense–industry exhibitions and joint committee processes, the article positions Indonesia–Spain cooperation as more than technical transactions: it functions as an instrument for shaping norms, reducing uncertainty, and widening coalitions that support global stability. Empirically, we mobilize qualitative insights from interviews, documents, and observation reported in a recent thesis on Indonesia–Spain cooperation to illuminate four dynamics: (1) the strategic functions of military diplomacy for confidence building and conflict prevention; (2) substantive forms of collaboration (education and training, joint aircraft production, limited intelligence exchange, and defense communications); (3) structural constraints (absence of a binding defense agreement, interagency coordination gaps, technology-transfer and compatibility hurdles, and limited absorptive capacity); and (4) global implications (Indonesia’s role as a mediator and proponent of multilateralism linking Indo-Pacific and European security debates). This article contributes theoretically by integrating defense diplomacy, strategic partnership, and middle-power literatures, and practically by outlining a policy roadmap that links institutionalized dialogue with capability pathways and measurable outcomes. We conclude that Indonesia–Spain cooperation offers a scalable model of smart-power-oriented military diplomacy suited to middle powers seeking relevance and responsibility in a contested order.