Japan Self-Defense Forces Advancing Towards Integrated Offense and Defense: Dual Transformation of Cyber Counterattack Capabilities and Next-Generation Electronic Warfare Systems

In March 2026, the Japanese Ministry of Defense announced three major military modernization measures, marking the Self-Defense Forces' transition from a traditional passive defense posture to an active defense capability. These three measures—proactive cyber-defense authorization, the first flight of next-generation electronic warfare aircraft, and the modernization of battlefield medical information systems—together constitute Japan's overall strategy to respond to the "most complex security environment since World War II."

On March 17, Chief Cabinet Secretary Hirokazu Matsuno officially announced at a press conference that the Self-Defense Forces would be authorized to implement "proactive cyber-defense" starting October 1, 2026. This means that the Japan Self-Defense Forces and police agencies will be able to "attack and incapacitate" enemy infrastructure used to launch cyberattacks. Matsuno emphasized that Japan currently faces "the most complex national security environment since World War II," and with the "advancement of the entire society's digitalization process," the threat of cyberattacks has had a "huge impact on the lives of citizens and economic activities," constituting "a significant threat to national security."

According to the new regulations, a government network management committee will have the authority to approve or reject applications for cyber operations. Once authorized, the Japanese police and Self-Defense Forces will be able to launch attacks while ensuring the protection of citizens' privacy. This policy is a concrete implementation of related legislation passed in 2025, marking another reinterpretation of Japan's post-war Constitution Article 9—from a complete renunciation of the ability to wage war to allowing military actions for self-defense purposes, and now to the capability for proactive cyberattacks.

Notably, according to the International Institute for Strategic Studies (IISS), at least 26 countries worldwide possess cyberattack capabilities. The think tank ranked the United States as the world's top cyber power in 2023, with Australia, Canada, China, France, Israel, Germany, and the Netherlands in the second tier, possessing "world-leading capabilities in certain categories." Japan, along with India, Indonesia, Iran, Malaysia, North Korea, Vietnam, Brazil, Estonia, Nigeria, Saudi Arabia, Singapore, South Africa, Turkey, and the UAE, is classified in the third tier, "having advantages or potential advantages in certain categories but significant weaknesses in others." This indicates that Japan still has considerable room to catch up in cyber warfare capabilities.

In parallel with the enhancement of cyber defense capabilities, the Japan Air Self-Defense Force's electronic warfare capabilities are also experiencing a generational leap. On the same day, March 17, the Japan Air Self-Defense Force completed the first test flight of the latest electronic warfare aircraft, the Kawasaki EC-2 Stand-Off Jammer, at Gifu Air Base in Gifu Prefecture. This long-range electronic warfare platform, based on the Kawasaki Heavy Industries C-2 transport aircraft, represents a significant technological breakthrough for Japan in the field of electromagnetic spectrum operations.

The design features of the EC-2 Stand-Off Jammer are quite remarkable. From the photos, it can be seen that the aircraft has a unique spherical nose, with additional external fairings added to the top and sides of the fuselage. These designs have been optimized to accommodate radar detection, radio frequency activity monitoring, and electronic warfare jamming antenna arrays. The spherical nose design also considers aerodynamic efficiency and flight stability to accommodate the additional external equipment.

The aircraft incorporates technologies from earlier Japanese electronic warfare systems, including the J/ALQ-5 countermeasure system and more advanced radio frequency sensing capabilities. Reports indicate that the J/ALQ-5 system has been migrated to this new EC-2 electronic warfare aircraft, enabling it to jam enemy electromagnetic spectrum operations from outside enemy defense ranges.

From the publicly available technical specifications, the EC-2 has a fuselage length of 43.9 meters, a wingspan of 44.4 meters, and a height of 14 meters, powered by two General Electric CF6-80C2K turbofan engines, with a maximum speed of 0.82 Mach (approximately 1,000 kilometers per hour). Notably, this aircraft retains the capabilities of the base transport model, making it a hybrid platform. The EC-2 has a maximum payload of 36 tons, capable of transporting heavy equipment such as the MIM-104 Patriot air defense system or H-60 helicopters, allowing it to perform tactical transport roles while executing electronic warfare missions.

The development of the EC-2 began in 2021 as a successor to the aging EC-1 electronic warfare platform, which entered service in June 1986—only one EC-1 remains in active service today. According to budget documents from the Japanese Ministry of Defense, the development cost of this project is 41.4 billion yen (approximately 280 million USD). Japan plans to procure four EC-2 jammers, significantly expanding Japan's electronic warfare capabilities and enabling it to maintain an advantage in the increasingly complex electromagnetic environment of Northeast Asia.

Alongside the modernization of high-tech weapon systems, the Japanese Ministry of Defense is also advancing the digital transformation of battlefield support capabilities. According to Japanese media reports, the Self-Defense Forces plan to introduce a new medical information system in fiscal year 2028, allowing frontline medical personnel to share casualty status and treatment details with rear Self-Defense Forces hospitals in a timely manner.

This information-sharing system is specifically designed for emergencies in the southwestern Nansei Islands of Japan, assuming the occurrence of sudden events that could result in a large number of Self-Defense Forces personnel being injured. Although not explicitly stated in the reports, this system is likely a digital solution aimed at improving evacuation and treatment efficiency by replacing the current manual recording of treatment details and subsequent transmission to the next medical facility with a paper-based method.

Under the new information-sharing system, frontline medical professionals' assessments of casualties and the care provided will be quickly shared with rear hospitals, enabling hospital staff to confirm the treatment provided and effectively assess patient conditions. In combat situations, trauma care for Self-Defense Forces personnel is expected to be provided at the front lines, with emergency surgeries conducted at mobile field surgical units, while more comprehensive treatment will require transporting patients to one of the Self-Defense Forces' main hospitals located at ten sites across Japan.

In the event of a sudden incident in the southwestern Nansei Islands, the Self-Defense Forces' Amphibious Rapid Deployment Brigade and other units will be mobilized to defend or reclaim key offshore areas. Personnel injured in the southwestern region are most likely to be transported to the Self-Defense Forces' Naha Hospital in Okinawa, which the Japanese Ministry of Defense emphasizes is "crucial" for Self-Defense Forces operations and is currently undergoing extensive infrastructure improvements. The emergency medical information-sharing system planned for introduction in fiscal year 2028, if connected to Naha Hospital, will be able to communicate the medical needs for airlifting patients from the southwestern offshore islands quickly and effectively.

According to Japan's 2022 National Defense Strategy, the Ministry of Defense has been seeking comprehensive reforms to the Self-Defense Forces' combat trauma care capabilities in recent years, transforming its medical force into an organization capable of providing life-saving care in hostile environments. Historically, due to a lack of experience in kinetic operations and combat casualties, the Self-Defense Forces have not prioritized specialized infrastructure and equipment for treating complex trauma injuries. However, given Japan's rapidly changing security environment and the complex injuries observed on the battlefield in Ukraine, the Ministry of Defense is now seeking to address these capability gaps.

Japan's latest defense budget commits to procuring the equipment and technology necessary for a "seamless medical and evacuation posture from the front lines to hospitals" in fiscal year 2026. Notably, within this framework, a subsidiary plan to ensure and stockpile blood products allocates 10 million yen (approximately 64,400 USD) for equipment related to the "Joint Medical Information System." These commitments from the Ministry of Defense for fiscal year 2026 lay an important foundation for the emergency medical information system planned for implementation in fiscal year 2028.

Related to the goal of providing real-time information sharing through the medical information system in fiscal year 2028 is the "Next Generation Information and Communication Strategy" announced by the Ministry of Defense last October. This is a broader plan envisioning the development of high-bandwidth, low-latency systems for the Self-Defense Forces and the integration of ICT infrastructure. The ICT strategy aims to establish a new network tentatively named the "New Defense Information Infrastructure" as the foundational ICT platform for all Ministry of Defense/Self-Defense Forces programs, integrating data collected through various assets. This multi-layered network plan includes medical care as one of the eight components of the system's "service layer."

The Ministry of Defense's service layer (the level pertaining to medical care) emphasizes the need to build an "environment that can flexibly develop, modify, add, and delete," indicating a strong inclination towards adopting a modular, open approach to medical information systems. Therefore, the Ministry of Defense needs to procure systems to support the implementation of this medical care service layer and ensure its close lateral connectivity with other identified services (especially logistics and information-sharing systems). Vertically, equipment is also needed to integrate these medical care systems with the multi-network architecture of the network infrastructure layer and the data layer, which aims to provide timely and reliable access to the information required across the entire information structure.

These three initiatives—cyber counterattack authorization, new electronic warfare aircraft, and digitized battlefield medicine—embody three key dimensions of Japan's defense transformation: the strategic shift from passive defense to proactive countermeasures in cyberspace, the establishment of long-range jamming and intelligence-gathering capabilities in the electromagnetic spectrum, and the modernization of information and networking in operational support. The synchronized development of these capabilities reflects Japan's profound recognition of the significant changes in the Northeast Asian security environment and its determination to substantially reinterpret the traditional principle of "exclusive defense." Particularly in the context of the Taiwan Strait situation and China's military modernization, Japan is building a more proactive and offensive defense system.