Japan's Defense Industry Transformation: The Triad of Lifting the Ban on Arms Exports, First Export of Mogami-Class Frigates, and Domestic Production of Drones

In the third week of April 2026, Japan's security policy is transforming at an unprecedented pace. The revisions to the Three Principles on Defense Equipment Transfers under the administration of Prime Minister Sanae Takaichi, the formal signing of the export contract for Mogami-class frigates to Australia, and the formulation of a new defense plan aimed at fostering a domestic drone industry—each of these three developments is groundbreaking on its own, but together they hold the potential to redefine Japan's post-war defense perspective.

On April 21, the Japanese government revised the Three Principles on Defense Equipment Transfers and their operational guidelines during a cabinet meeting and a National Security Council session. Until now, the exportable equipment was limited to five non-combat uses: rescue, transport, surveillance, monitoring, and mine sweeping. This restriction has been lifted with the recent revision. Equipment is now divided into "weapons" and "non-weapons," with the export of non-weapons such as radar systems being generally liberalized. On the other hand, the export of weapons such as destroyers and missiles is only permitted to 17 countries with which Japan has signed confidentiality agreements regarding defense equipment and technology. After the decision, Prime Minister Takaichi stated on social media, "No country can guarantee peace and security on its own anymore; we need partners who can mutually support each other in the field of defense equipment," clearly advocating for the collectivization of security.

The backdrop to this revision is the rapid deterioration of the security environment surrounding Japan. China's maritime expansion has extended from the South China Sea to the East China Sea, and tensions over the Taiwan Strait are directly affecting Japan-China relations. Last weekend, a Japan Maritime Self-Defense Force destroyer transited the Taiwan Strait, prompting Beijing to show its intent to expand pressure on Japan beyond the economic sphere into the realm of security. North Korea also launched a ballistic missile on April 19, showcasing its deterrent capabilities amid the international turmoil surrounding the Iran conflict. Furthermore, over 10,000 U.S. troops have been mobilized for the U.S. operation to contain Iran in the Strait of Hormuz, raising concerns about the stability of energy supplies and adding a new dimension to Japan's security discussions.

Amid these changes, Japan's defense industry is beginning to move towards concrete business opportunities. The most symbolic development is the export contract for Mogami-class frigates, which was officially signed with Australia on April 18. The first three general-purpose frigates, constructed by Mitsubishi Heavy Industries, form the core of a project worth a total of 20 billion Australian dollars (approximately 14.3 billion U.S. dollars). This marks Japan's first export of military vessels since the war and indicates that defense industrial cooperation between Japan and Australia has entered a new phase. The Mogami-class frigate is a multi-role vessel with a displacement of about 5,500 tons, designed for stealth and suitable for coastal defense missions of various navies.

The wave of weapon export liberalization is also bringing significant changes to defense industry companies. IHI and Mitsubishi Heavy Industries have announced plans to expand production capacity, embarking on the construction of new factories and increasing personnel. Defense Minister Shinjiro Koizumi stated in an interview on April 22, "The government must take the lead in promoting defense production," positioning the domestic production of unmanned equipment, including drones, as a top priority. In fact, on April 24, the Japanese government revealed an outline of a new defense plan aimed at establishing a domestic drone industry. The plan aims to build an industrial base capable of mass-producing both civilian and military unmanned aerial vehicles in peacetime, and to create a system that can rapidly scale up production in times of crisis. Participation from domestic startups like ACSL is also anticipated, clearly indicating Japan's intention to incorporate the strategic value of drones, as demonstrated in the Ukraine war, into its defense framework.

Japan's presence in the South China Sea is also increasing. The joint military exercises between the Philippines and the United States, which began on April 20, will see the Self-Defense Forces participate in a significant manner for the first time, including training for ship sinking. The Philippine government has described this as a "historic convergence," indicating that Japan's security commitment to the South China Sea has entered a practical phase.

On the other hand, such rapid changes are accompanied by domestic political concerns. The opposition parties are calling for prior approval from the Diet for arms exports, arguing that the government's post-factum reporting system poses a risk of Japan becoming embroiled in escalating conflicts or arms races. While operational safeguards such as individual reviews by the National Security Council and thorough equipment management through investigations into the military of the exporting countries are in place, their effectiveness will depend on future operations. Additionally, there is an exception requiring cabinet approval for the next-generation fighter jet (jointly developed by Japan, the UK, and Italy), which also necessitates ongoing verification from a transparency perspective.

Furthermore, the incident involving the Ground Self-Defense Force's tank accident in Oita Prefecture, which resulted in the deaths of three personnel, may impact the training system of the Self-Defense Forces. The accident, in which a tank shell exploded unintentionally during training on April 21, suggests that as modernization of equipment progresses, attention must also be paid to the safety management of conventional equipment.

Overall, Japan in the spring of 2026 is transitioning from its post-war self-image as a "peace-loving nation" to a new paradigm of collective security and the promotion of the defense industry. The liberalization of arms exports, the realization of military vessel exports, and the initiation of domestic drone production—these are not just individual policies but multiple facets of a single trend towards the "industrialization" of security. The success of this transition hinges on how much Japan can enhance the international competitiveness of its defense industry and how it can maintain democratic control domestically.