Regionalization of Defense in Comparative Perspective: Legal Analysis of the Cases of Japan and Spain

Keywords: Japan, Spain, Regionalization, Defense, Security

Abstract

This article aims to present a comparative study on the regionalization of defense policy in Japan and Spain from a legal perspective. Although both states constitutionally assign defense to the central government, they differ significantly in their political structures: Japan follows a centralized unitary model, while Spain combines this unity with a high degree of decentralization through the extensive powers granted to its Autonomous Communities. The article examines the constitutional and legal frameworks governing defense in each country, as well as the impact of regional autonomy (or its absence) on the formulation and implementation of defense policies, taking into account geopolitical factors such as Spain’s membership in NATO and the pacifist constraints imposed by Japan’s Constitution. The aim is to offer a comparative view of how two distinct political models balance national defense with regional governance.

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Published
2026-07-27
How to Cite
Cisneros Cristóbal, P. (2026). Regionalization of Defense in Comparative Perspective: Legal Analysis of the Cases of Japan and Spain. Mirai. Estudios Japoneses, 10, 69-81. https://doi.org/10.5209/mira.102464