Japan Security Report — October 25, 2026

Security analysis based on open-source intelligence and web research. Period: October 18 — October 25, 2026.

Executive Summary

Japan has experienced a dynamic security landscape between October 18 and October 25, 2026, marked by significant military exercises, a declared "cyberspace emergency," and active diplomatic engagements. The Keen Sword 27 joint military drills with the United States and seven other nations commenced, notably featuring the first-time deployment of Japan's longer-range Type 25 surface-to-ship missiles, signaling a shift towards enhanced counterstrike capabilities. Concurrently, Japan grappled with a wave of sophisticated cyberattacks, prompting a "cyberspace emergency" declaration and the activation of new active cyber defense measures. Diplomatically, Japan pursued economic and defense cooperation with Germany and strengthened ties with Pacific Island nations, while Prime Minister Takaichi expressed intent to engage China at the upcoming APEC summit despite strained bilateral relations. These developments underscore Japan's proactive approach to bolstering its defense posture and diversifying its security partnerships amidst evolving regional challenges.

Key Security Developments

• Military Activities and Exercises: Keen Sword 27 Kicks Off with New Missile Deployments
  The largest-ever bilateral U.S.-Japan military exercises, Keen Sword 27, commenced on October 18, 2026, and are scheduled to run through October 29. The drills involve approximately 45,000 Self-Defense Force (SDF) personnel and 12,000 U.S. service members, with participation from seven other countries, including France and Germany for the first time. A significant "first" in these exercises is Japan's deployment of its longer-range Type 25 surface-to-ship missiles outside their base in Kumamoto Prefecture, specifically to the Onobaru Maneuver Area spanning Nagasaki and Saga prefectures, and to Yonaguni Island. The Type 25 missile, with an approximate range of 1,000 km, is a key component of Japan's "counterstrike capability" and is seen as a dress rehearsal for defending Japan's southwestern island chain, particularly near Taiwan. The U.S. side also deployed advanced anti-ship missile systems (NMESIS) and air defense equipment (MADIS) to Yonaguni, an island just 110 kilometers from Taiwan.

• Defense Policy and Strategic Shifts: Enhanced Counterstrike Capability and Public Outreach
  The deployment of the Type 25 surface-to-ship missiles during Keen Sword 27 signifies a notable shift in Japan's defense policy, moving beyond a purely defensive posture to incorporate "counterstrike capabilities" designed to deter attacks and strike enemy targets. This exercise is also the first iteration since Japan's Joint Operations Command (JJOC) was established in March 2025, indicating a more integrated command structure. Furthermore, the Japanese government plans to revise its three key security policy documents by the end of 2026, with a focus on "new ways of warfare," sustained combat capabilities, and increased defense spending, including large-scale acquisitions of unmanned aircraft. To garner public support for these changes, the government is launching a public outreach campaign from late October, utilizing social media, videos with public figures, and advertisements in prominent locations like Tokyo subway trains and Shibuya Crossing.

• Diplomatic Relations: Engagements with Germany, Micronesia, and China
  Japanese Prime Minister Sanae Takaichi and German Chancellor Friedrich Merz are arranging a summit in Tokyo for October 28, focusing on economic security, bolstering supply chains for semiconductors and critical minerals, and cooperation in developing and producing defense equipment, including drones. Germany's potential participation in the Global Combat Air Program (GCAP) is also on the agenda. On October 23, Prime Minister Takaichi held a summit meeting with President Wesley W. Simina of the Federated States of Micronesia, affirming cooperation under the updated "Free and Open Indo-Pacific (FOIP)" concept and strengthening bilateral relations. Amidst strained relations with China, Prime Minister Takaichi has expressed her intention to attend the Asia-Pacific Economic Cooperation (APEC) leaders' summit in Shenzhen, China, in November, signaling a willingness to engage Beijing despite tensions over Taiwan. However, it remains uncertain whether Chinese President Xi Jinping will hold bilateral talks with Takaichi.

• Cybersecurity: "Cyberspace Emergency" and Active Defense Activation
  Japan has declared a "state of emergency in cyberspace" following a wave of AI-accelerated ransomware and data breaches that have compromised the personal information of millions of citizens and affected over 20 major companies. On October 25, GMO Internet requested the government implement active cyberdefense operations after an unauthorized access incident potentially affecting 26,739 servers and user login information. This comes after Japan formally activated its Active Cyber Defense (ACD) system on October 1, 2026, which authorizes the Self-Defense Forces and police to pre-emptively neutralize attacker servers, including those located abroad. Japan also announced on October 23 that it will establish a team to simulate cyberattacks using AI to identify system weaknesses, particularly in response to critical vulnerabilities in the PHP programming language that have led to millions of hacking attempts globally. A Japanese security firm has linked part of the recent cyberattack wave to ARTEX, a Chinese-developed AI penetration-testing tool.

• Maritime and Border Security: Middle East Mission Extension and Regional Cooperation
  The Japanese government plans to extend the Maritime Self-Defense Force's mission in the Middle East by one year, to November 2027, to ensure the safety of Japanese-linked vessels. This is a routine extension reflecting the ongoing security rationale in the region. In Southeast Asia, Malaysia's Defense Minister, Datuk Seri Mohamed Khaled Nordin, visited Japan from October 18 to 21, aiming to strengthen maritime defense capabilities through technology transfer, military exercises, and government-to-government procurement. Japan signed an agreement under its Official Security Assistance (OSA) program for 2026, providing Malaysia with a Counter-Unmanned Aircraft System (C-UAS) worth 1.65 billion yen.

• US-Japan Alliance: Broadening Scope and North Korea Dialogue
  The U.S.-Japan alliance continues to evolve, expanding beyond traditional military cooperation to encompass economic security, advanced technology, and regional deterrence. During high-level talks in Tokyo on October 13, the United States and Japan reaffirmed their commitment to the complete denuclearization of North Korea and the immediate resolution of the abduction issue. They also welcomed Japan's growing cooperation with the North Atlantic Treaty Organization (NATO).

Geopolitical Impact and Regional Dynamics

Japan's security developments during this period significantly impact regional stability, particularly in the Indo-Pacific. The Keen Sword 27 exercises, with their unprecedented scale and the deployment of long-range Type 25 missiles to Japan's southwestern islands near Taiwan, are a clear signal of Japan's enhanced deterrence capabilities and its commitment to regional security alongside the United States. This move is likely to be viewed with concern by China, which has historically criticized large-scale U.S.-Japan military exercises as a threat to regional security and has been particularly unnerved by Japan's deployment of standoff missiles to its far-flung islands. The exercises, therefore, contribute to heightened tensions in the East China Sea and around the Taiwan Strait, areas already prone to geopolitical friction.

Japan's active diplomatic engagements, such as the planned summit with Germany focusing on economic security and defense cooperation, and the strengthening of ties with Micronesia under the "Free and Open Indo-Pacific" (FOIP) framework, demonstrate a concerted effort to diversify partnerships and reduce dependence on China. These initiatives align with a broader strategy to counter growing Chinese influence in the region and reinforce a rules-based international order. The potential for a Japan-China leadership meeting at the APEC summit in November, despite a "deep freeze" in bilateral relations, suggests a cautious willingness from both sides to manage tensions, though significant breakthroughs are uncertain given past disagreements over Taiwan.

The ongoing wave of sophisticated cyberattacks, some potentially linked to a Chinese-developed AI tool, introduces another layer of complexity to regional dynamics. While not directly attributed to state actors in all cases, the scale and sophistication of these attacks, coupled with Japan's activation of offensive cyber defense capabilities, highlight the growing importance of cyberspace as a domain of strategic competition and potential conflict. This could further strain relations with countries suspected of harboring or sponsoring such cyber activities. Overall, Japan's actions reflect a strategic balancing act: strengthening its defense capabilities and alliances to deter potential adversaries, while simultaneously engaging in diplomacy to manage complex regional relationships and promote economic security.

Military and Defense Analysis

Japan's military and defense posture is undergoing a significant transformation, as evidenced by the developments this week. The Keen Sword 27 exercises are a critical indicator of Japan's evolving force posture, particularly the first-time deployment of the Type 25 surface-to-ship missiles with a 1,000 km range. This deployment signals a clear move towards developing a credible "counterstrike capability," allowing Japan to project power beyond its immediate territorial defense and deter potential aggressors by threatening their assets at a distance. The exercises also demonstrate enhanced interoperability with the U.S. and other partner nations, with joint training on targeting information sharing and launch procedures, which is crucial for effective coalition operations in a crisis.

Modernization programs are a central pillar of Japan's defense strategy. The planned revisions to its three key security documents later this year are expected to prioritize large-scale acquisitions of unmanned aircraft and set targets for increased defense spending. This focus on unmanned systems reflects a recognition of future warfare trends and the need for advanced capabilities in areas like intelligence, surveillance, reconnaissance, and precision strike. The establishment of the Joint Operations Command (JJOC) in March 2025 further underscores Japan's commitment to a more integrated and agile defense structure, crucial for coordinating complex multi-domain operations. The defense spending trends are clearly on an upward trajectory, driven by perceived threats from China and North Korea, and a desire to play a more prominent role in regional security.

Capability developments are not limited to conventional forces. Japan's activation of its Active Cyber Defense (ACD) system on October 1, 2026, marks a significant step in developing offensive cyber capabilities, allowing the SDF and police to neutralize attacker servers. This is a critical development in an era where cyberattacks are increasingly sophisticated and can have widespread national security implications. The planned establishment of an AI-powered cyberattack simulation team further highlights Japan's commitment to enhancing its cybersecurity resilience and adapting to the evolving nature of cyber threats. These military and defense advancements collectively indicate Japan's determination to strengthen its self-defense capabilities and contribute more substantially to regional security.

Outlook and Forecast

In the short term (1-3 months), Japan is likely to continue its robust military exercises and diplomatic engagements. The ongoing Keen Sword 27 drills will conclude, but the lessons learned and the demonstrated capabilities, particularly the deployment of the Type 25 missiles, will likely inform future defense planning and procurement. We can anticipate continued high-level diplomatic activity, including the planned Japan-Germany summit on October 28, which will solidify cooperation on economic security and defense industrial ties. Prime Minister Takaichi's potential attendance at the APEC summit in China in November will be a critical indicator of the trajectory of Japan-China relations, with any bilateral meeting between leaders being closely scrutinized. The Japanese government's public outreach campaign on security policy will also intensify, aiming to shape public opinion ahead of key defense policy revisions.

Critical flashpoints and risk areas for Japan in the immediate future include the Taiwan Strait and the Senkaku/Diaoyu Islands. The deployment of long-range missiles to Japan's southwestern islands, in close proximity to Taiwan, could provoke strong reactions from China, potentially leading to increased military posturing or maritime incursions in disputed areas. The ongoing and sophisticated cyberattacks, particularly those potentially linked to foreign state-sponsored actors, represent a persistent and evolving threat that could escalate into more severe incidents, impacting critical infrastructure or national security. North Korea's continued missile testing and military signaling will also remain a source of regional instability, necessitating ongoing vigilance and close coordination with allies.

Key indicators to monitor include China's official and unofficial responses to the Keen Sword exercises and Japan's missile deployments, as these will reveal Beijing's tolerance thresholds and potential countermeasures. The outcomes of the Japan-Germany summit, especially regarding defense industrial cooperation and Germany's potential involvement in GCAP, will signal the deepening of Japan's security partnerships beyond the Indo-Pacific. The effectiveness of Japan's newly activated active cyber defense system in deterring or neutralizing future cyber threats will be a crucial measure of its cybersecurity resilience. Finally, any progress or lack thereof in dialogue between Prime Minister Takaichi and Chinese President Xi Jinping at APEC will be a significant barometer for the future of Sino-Japanese relations.

Strategic recommendations for Japan include maintaining a robust and transparent communication strategy regarding its defense posture to manage regional perceptions and avoid miscalculation. Continued investment in advanced defense capabilities, particularly in missile defense, anti-ship systems, and unmanned platforms, is essential to reinforce deterrence. Further strengthening of alliances and partnerships, both bilaterally with the U.S. and multilaterally with like-minded nations, will be crucial for collective security and burden-sharing. Domestically, sustained efforts to enhance cybersecurity infrastructure and capabilities, coupled with public awareness campaigns, are vital to protect against persistent cyber threats. Diplomatically, Japan should pursue a nuanced approach with China, seeking opportunities for dialogue and de-escalation while firmly upholding its national interests and regional security principles.

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