Japanese Frigates and Taiwan: The Beginning of a New Defense Alliance in Asia

The accelerating shifts in Japanese defense policy open the door to new questions about the future of the security relationship between Tokyo and Taipei, as increasing indicators have begun to emerge of Japan's gradual involvement in supporting Taiwanese military capabilities, amid rising tensions with China in the Indo-Pacific region.

These questions came after Taiwanese media reports, in mid-April 2026, spoke of the Taiwanese navy's evaluation of the upgraded Japanese frigate of the "Mogami" class as a potential option for a new-generation warship, with information indicating that Tokyo quietly eased restrictions related to transferring warship blueprints to Taipei.

Although Japanese authorities have not confirmed those reports, the mere proposal of this scenario reflects a major shift in the Japanese political and legal environment, especially since such an idea was considered nearly impossible just a few years ago.

Taiwan Seeks a Second Defense Partner

Taiwan faces increasing challenges in modernizing its naval fleet, as a large portion of its main warships have exceeded traditional service decades, while Taipei is undertaking modernization programs including the production of local corvette ships, the development of "Kang Ding" frigates, in addition to the local submarine program which saw the submarine "Hai Kun" conduct sea trials in 2025.

But reliance on the United States as a primary defense supplier is no longer sufficient to meet all needs, which drives Taiwan to search for a second democratic partner that can provide the necessary technology and industrial and military expertise.

In contrast, Japan has witnessed in recent years a notable shift in its policies related to arms exports. In December 2023, Fumio Kishida's government amended the principles for transferring defense equipment, allowing limited exports of lethal equipment within specific operational categories, before the Japanese government later expanded the scope of these amendments.

Internal political changes also contributed to strengthening this trend, especially after the end of the long alliance between the Liberal Democratic Party and the Komeito Party, which was one of the most prominent opponents of liberalizing defense exports, in addition to the arrival of Prime Minister Sanay Takaichi, who is known for her hardline stances towards China and Taiwan.

China Responds Early to Japanese Shifts

The new Japanese positions sparked sharp Chinese reactions, as Beijing imposed a series of economic and trade restrictions on major Japanese defense companies, including Mitsubishi, Kawasaki, and IHI, in a step interpreted by observers as an attempt to deter Tokyo from deeper involvement in supporting Taiwan.

According to the analysis, China is already dealing with Japan as if it has become a direct security partner for Taipei, even before any announced military cooperation at the level of combat platforms.

This impression is reinforced by Japan's success in concluding a massive agreement with Australia to export upgraded "Mogami" frigates, as part of a defense program worth about 20 billion Australian dollars over a full decade.

The importance of the Australian deal is not limited to selling ships, but extends to technology transfer, and building a long-term industrial and security partnership, a model that analysts say could form a foundation to build upon in any potential future cooperation with Taiwan.

Gradual Cooperation Instead of Direct Alliance

Nevertheless, the legal and political differences between the Australian and Taiwanese cases remain significant. There are no formal diplomatic relations between Japan and Taiwan, no agreements for transferring defense equipment, and the current legal framework does not allow Tokyo to directly sell ready-made warships to Taipei.

Therefore, the analysis sees that any future cooperation will need a gradual path starting from less sensitive areas, such as cooperation between coast guards, maritime surveillance systems, communications networks, and defense components, before moving later to more advanced stages including training, maintenance, and exchange of expertise.

Cooperation could also include transferring technical components such as radar, sonar, and electronic warfare systems, within Taiwanese local manufacturing programs, which allows Japan to contribute to enhancing Taiwan's defense capabilities without crossing current legal and political lines.

Analysts believe that such a model gives Tokyo a wider margin for maneuver, especially since China is already imposing economic pressure on Japan, meaning that a policy of "self-restraint" may not provide Tokyo with real protection from Chinese escalation.

Amid increasing tension in the Taiwan Strait, and the continuous change in Japanese security doctrine, it seems the question is no longer just about the possibility of defense cooperation between Japan and Taiwan, but rather about the speed at which this relationship might develop, and the limits of what Tokyo can accept in the face of escalating Chinese pressure.