Japan’s Rising Hard Power and Implications for Southeast Asia

Since the end of World War II, Japan’s influence in Southeast Asia has largely been shaped by its economic strength, diplomatic efforts, and cultural appeal. However, as China’s economic and technological influence grows, Japan is increasingly focusing on bolstering its hard power capabilities and expanding its security networks. This shift is driven by a changing regional and global security landscape and a need to reconcile its post-war pacifist identity with a more assertive security posture.

Japan’s Changing Strategic Outlook

Japan’s strategic approach is evolving from one focused on economic influence and multilateral engagement to a more pragmatic realpolitik approach. This shift is fueled by several factors, including China’s military expansion in the East and South China Seas Council on Foreign Relations, Russia’s invasion of Ukraine, and continued nuclear and missile threats from North Korea U.S. Department of State. The perceived unreliability of the United States under recent administrations has also prompted Japan to take greater responsibility for its own defense.

The “Free and Open Indo-Pacific” concept, introduced by Prime Minister Shinzo Abe in 2012, signaled this strategic turn. This concept aims to counterbalance China’s power by building a network of alliances with countries like India, the United States, and other like-minded partners. In 2014, the Abe government reinterpreted the constitution to allow the Japan Self-Defense Force (JSDF) to participate in collective self-defense missions.

Strengthening Defence Capabilities

Successive Japanese governments have continued to reinforce this trajectory. The 2022 National Security Strategy (NSS) and National Defence Strategy (NDS) identified the security environment as “as severe and complex as it has ever been since the end of World War II” and committed to fundamentally reinforcing defense capabilities. Key initiatives include the development of counter-strike capabilities with Tomahawk cruise missiles and domestically produced long-range missiles, and an increase in defense spending to 2% of GDP by 2027.

Current Prime Minister Sanae Takaichi has accelerated this timeline, aiming for the 2% target by fiscal year 2025. She is also advancing plans to establish a national intelligence agency, revise regulations on defense equipment exports, and expand domestic weapons manufacturing, potentially positioning Japanese firms as significant global arms players. Japan’s arms imports surged by 155% between 2019 and 2023, making it the sixth-largest weapons importer globally.

Expanding Defence Partnerships in Southeast Asia

Japan is expanding its defense cooperation with Southeast Asian nations, particularly the Philippines, Vietnam, Indonesia, Malaysia, and Cambodia. Military exercises have increased since 2014, focusing on maritime security. Japan’s provision of defense equipment has also grown, facilitated by the Official Security Assistance (OSA) scheme launched in 2022, which provides non-lethal defense equipment to partner countries.

The Philippines has been a major beneficiary of the OSA, receiving equipment to enhance its maritime domain awareness. A landmark Reciprocal Access Agreement (RAA) between Japan and the Philippines entered into force in 2025, strengthening their security ties. Malaysia has received rescue boats, and discussions are underway for co-production of frigates with Indonesia. Vietnam has received patrol vessels and is collaborating with Japan on defense equipment and technology transfer.

Global Strategic Networking

Beyond Southeast Asia, Japan is deepening security cooperation with a broader range of partners. This includes participation in the UK-Italy-Japan Global Combat Air Programme (GCAP) to develop a sixth-generation fighter, and a deal with Australia for the construction of Mogami-class frigates. Japan is also strengthening ties with NATO and the European Union, focusing on maritime security, cyber threats, and defense-industrial collaboration.

Japan is actively involved in minilateral frameworks like the Quad (United States, Japan, Australia, and India) and the SQUAD grouping (United States, Japan, Australia, and the Philippines) to shape the Indo-Pacific security architecture.

Implications for Southeast Asia

Japan’s security engagements in Southeast Asia have been generally well-received, largely due to its cautious approach and sensitivity to regional political dynamics. However, Southeast Asian countries must navigate the complex relationship between Japan and China, balancing their economic ties with both powers.

Trust in Japan remains high in Southeast Asia, with a growing number of respondents viewing Japan’s military power as a positive force for regional peace, and security. However, Tokyo must be mindful of historical sensitivities and avoid actions that could be perceived as provocative or confrontational.

Japan’s success in the region will depend on its ability to communicate its evolving role effectively, maintain its commitment to ASEAN-led mechanisms, and respect the diverse strategic perspectives of Southeast Asian nations.