Philippines to Receive Japanese Warships Amid Deepening Defense Ties and China's Warnings

Japan's naval modernization is no longer solely focused on strengthening its own fleet but is now an integral part of a wider security shift across the Indo-Pacific. This shift involves Japan forging deeper defense relationships with countries such as the Philippines, Australia, and the United States, a development closely monitored by China with increasing concern. A key symbol of Japan's evolving military posture is the Mogami-class frigate; the JS Notori, the ninth vessel, was commissioned on May 21st, 2026, followed by the JS Nagara, the tenth, delivered on June 29th. Mitsubishi Heavy Industries confirms these ships have a standard displacement of approximately 4,000 tons.

The Maritime Self-Defense Force indicates that Mogami-class frigates typically operate with crews of around 90 personnel, which is a relatively small crew given the vessels' extensive range of capabilities. Each Mogami-class frigate is equipped with a 5-inch naval gun, a CRAM defensive missile system, surface-to-surface missiles, anti-submarine systems, mine warfare equipment, unmanned underwater and surface vehicles, helicopter facilities, and a vertical launch system. This design addresses Japan's dual challenges of needing to patrol larger areas and participate in more multinational exercises, while also responding to increasing regional complexities and managing long-term demographic and military recruitment pressures.

Japan faces ongoing long-term demographic and military recruitment pressures, making the Mogami-class frigate more than just a new warship; it represents an effort to build a fleet capable of greater operational capacity with fewer personnel. The strategic importance of this program now extends beyond Japan's borders, with Australia committing to acquire 11 upgraded Mogami-class general-purpose frigates. Contracts for the first three were finalized, and the first vessel is scheduled for delivery in 2029. Australian officials describe the upgraded design as having a range of approximately 10,000 nautical miles, 32 vertical launch cells, and a crew of 120, highlighting its enhanced capabilities.

This represents one of the most significant international successes for Japan's defense industry in decades. Historically, Japanese governments maintained extremely strict restrictions on military exports in the post-war period, but these rules have been gradually relaxed. Tokyo is increasingly willing to provide defense equipment to countries it considers important security partners, with the Philippines now emerging as one of the most prominent among them. However, it is crucial to note a factual distinction: Japan is not transferring new Mogami-class frigates like JS Notori or JS Nagara to the Philippine Navy. Instead, the vessels under discussion for Manila are older Abukuma-class destroyer escorts that are expected to be retired from Japanese service, with other areas under discussion including TC 900 aircraft, radar systems, infrastructure, and military support.

The distinction regarding the types of vessels being transferred is important, as the broader Japan-Philippines defense relationship is already substantial, without exaggerating the specifics of equipment transfers. The legal foundation for this relationship has expanded rapidly. The Japan-Philippines Reciprocal Access Agreement (RAA) officially entered into force on September 11, 2025. This agreement establishes procedures governing Japanese forces temporarily operating in the Philippines and Philippine forces operating in Japan, thereby facilitating joint exercises, disaster relief missions, and other agreed military activities. Furthermore, Japan and the Philippines signed an Acquisition and Cross-Servicing Agreement (ACSA) on January 15, 2026, with diplomatic notes exchanged on July 2 of the same year.

The Acquisition and Cross-Servicing Agreement (ACSA) between Japan and the Philippines officially entered into force on August 22nd, 2026. This signifies a progression from the earlier stage where the agreement was signed but not yet operational. The ACSA establishes a framework allowing the Japan Self-Defense Forces and the Armed Forces of the Philippines to provide supplies and services to one another during agreed activities. Concurrently, the operational relationship between the two nations has been developing rapidly. During Balikatan 2026, Japanese forces participated alongside Philippine, American, and other partner forces within an increasingly sophisticated multinational exercise framework. One particular event during Balikatan garnered significant attention from Beijing: on May 6th, Japanese Defense Minister Shinjiro Koisumi and Philippine Secretary of National Defense Gilbert Teodoro Jr. observed the first live-fire exercise involving Japan's Type 88 surface-to-ship missile system.

Japanese Defense Minister Shinjiro Koisumi and Philippine Secretary of National Defense Gilbert Teodoro Jr. observed the first live-fire exercise involving Japan's Type 88 surface-to-ship missile system in Ilocos Norte, as part of Balikatan 2026. The significance of this event extended beyond a single missile launch, as Japan had demonstrated a land-based anti-ship capability within an archipelagic country strategically located near some of Asia's most sensitive waters. China immediately responded, with its foreign ministry spokesperson, Lin Jian, connecting the exercise to Japan's wartime history and accusing Tokyo of accelerating what Beijing describes as remilitarization. Lin Jian urged Japan to take concrete actions to avoid further damaging mutual trust and regional peace and stability in its military and security areas.

Japan firmly rejects Beijing's characterization of its policy as a return to militarism, arguing that stronger defense partnerships, joint exercises, and equipment transfers are intended to strengthen deterrence and help regional partners defend themselves. The Philippines has increasingly embraced deeper cooperation with Japan. On May 28th, President Ferdinand Marcos Jr. met Prime Minister Fumio Kishida in Tokyo during a state visit, where their governments elevated their relationship to a comprehensive strategic partnership—the first such category for the Philippines. The leaders also agreed to begin negotiations on an agreement to facilitate mutual defense cooperation and capabilities.

Three days later, Japanese Defense Minister Koisumi and Philippine Secretary Teodoro met in Singapore. Japan's defense ministry reported that the two ministers reached a broad consensus to proceed with discussions aimed at promptly transferring Abukuma-class vessels after their decommissioning. They also agreed to work toward transferring one TC 90 aircraft within Japan's fiscal year 2027. Training, maintenance, sustainment, and management of the equipment after transfer remain part of the discussions. The Philippine government has been more specific about its expectations, with Secretary Teodoro announcing on July 7th that the Philippines expects five newly retired Abukuma-class vessels and estimating that the administrative details are being finalized, asserting it is already a "done deal."

The wording surrounding the vessel transfer requires careful consideration. The Philippine government has publicly spoken of expecting five vessels and presented the transfer with considerable confidence. In contrast, Japan's publicly released defense documents have confirmed a broad consensus on moving toward an Abukuma transfer but have been more cautious about the specific details. Therefore, the most accurate description is that the transfer process has significantly advanced; Manila expects five ships, and both sides are continuing the practical work necessary to complete the transfer, though these vessels have not yet entered Philippine Navy service. Japan's assistance to Manila extends beyond large warships, as evidenced by a 900 million yen official security assistance package approved by the National Security Council to construct boathouses and slipways for rigid-hull inflatable boats used by the Philippine Navy.

Previous Japanese assistance to the Philippines included coastal radar systems, monitoring and surveillance equipment, and support for Philippine air surveillance capabilities. While these projects may seem technical individually, collectively they tell a much larger story. The Philippines is significantly improving its maritime surveillance, naval infrastructure, and military training, enabling Japanese forces to operate more easily within the Philippines. The Acquisition and Cross-Servicing Agreement (ACSA) now provides a logistics framework, and both governments are working towards stronger protection for classified military information. While Manila anticipates additional Japanese naval vessels, these developments do not signify the creation of a new four-country military alliance involving Japan, the Philippines, the United States, and Australia.

The deepening cooperation does not imply a new four-country military alliance or a commitment for Japan, the Philippines, the United States, and Australia to respond militarily together in every South China Sea confrontation. However, interoperability remains crucial. When armed forces repeatedly exercise together, establish access arrangements, practice logistics, share information, and learn to operate compatible systems, they create military and political options that did not previously exist. If a serious crisis were to develop, these governments would not need to build cooperation from scratch. For Manila, this has become increasingly vital as confrontations with China have continued.

On July 20th, Philippine authorities accused China Coast Guard personnel of assaulting Philippine Navy personnel at Ayungin Shoal (Second Thomas Shoal), resulting in two Filipino servicemen requiring treatment for injuries. China disputed Manila's account, accusing Philippine personnel of instigating the confrontation. Just days later, tensions escalated again around Bajo de Masinloc (Scarborough Shoal) on July 23rd and 24th. Philippine Coast Guard and Bureau of Fisheries and Aquatic Resources vessels were carrying out a fuel support mission, while China maintained that it was taking control measures in waters Beijing claims. These incidents illustrate how quickly encounters involving patrol vessels, small boats, or fishing missions can escalate into serious confrontations.

Despite strengthening defense relationships, President Marcos is simultaneously trying to prevent the situation from sliding toward armed conflict. In August, Marcos explained that his proposed diplomatic reset with China is intended to reduce tensions and maintain open communication whenever relations begin moving in a dangerous direction. He has emphasized that stronger Philippine defense capabilities do not equate to Manila seeking confrontation with Beijing. This leaves the Philippines pursuing two tracks: stronger deterrence combined with active diplomacy. Beijing, however, perceives much of the regional military networking differently, with Chinese officials repeatedly criticizing Japan's expanding security role and its loosening of restrictions on defense exports.

China announced sanctions against Philippine Defense Secretary Teodoro and members of his immediate family, accusing him of making remarks that harmed Chinese interests and bilateral relations. However, China's concern should not be exaggerated into unsupported claims about President Xi Jinping personally reacting in fury to a supposed transfer of Japan's newest frigates. There is no verified public evidence that Xi personally announced such a reaction. More importantly, Japan is not transferring new Mogami-class frigates to Manila; the discussions concern retired Abukuma-class vessels. Documented Chinese criticism has largely been delivered through foreign ministry spokespersons and other official government channels. As of August 2026, Xi Jinping remains China's president, general secretary of the Communist Party of China Central Committee, and chairman of the Central Military Commission.

In Tokyo, Fumio Kishida remains Japan's prime minister, while Shinjiro Koisumi remains minister of defense. In Manila, Ferdinand Marcos Jr. remains president and Gilbert Teodoro Jr. remains secretary of national defense. The deeper story then is not one dramatic warship transfer, but rather the accumulation of numerous elements: more ships, more radar, more maritime infrastructure, more joint exercises, more logistics cooperation, more access arrangements, more information sharing, and increased military assistance. For the Philippines, another major Asian military power is becoming a more important defense partner. For Australia and the United States, closer Japan-Philippines ties add another layer to a broader regional network whose forces are becoming increasingly familiar with one another.

For China, these same developments can appear to be pieces of a gradually tightening strategic network along some of its most important maritime approaches. This is why individual ships matter, even when they are not the newest models. Five retired Abukuma-class vessels would not suddenly give the Philippine Navy control of the South China Sea, nor can a single Mogami-class frigate unilaterally change the balance of power across the Indo-Pacific. The true strategic shift comes from the cumulative effect of everything being added together: ship surveillance, missile capabilities, logistics agreements, infrastructure, exercises, access arrangements, and defense exports. These elements are steadily creating a relationship that is deeper than anything Japan and the Philippines maintained in previous decades.

The ongoing developments represent a process that is slower, broader, and potentially more consequential than a sensational story about Japan suddenly handing its newest warships to Manila. Japan and the Philippines are actively building a robust defense partnership with solid legal, operational, industrial, and political foundations. As confrontations continue around Ayungin Shoal and Scarborough Shoal, every additional ship, exercise, logistics agreement, and surveillance capability becomes another significant factor in the regional security competition, steadily altering the strategic landscape of the Indo-Pacific.