What the Five Coastal Radars Provided by Japan to the Philippines Protect

On February 11, at a handover ceremony held in Manila, Japan's Ambassador to the Philippines, Kazuya Endo, officially handed over five coastal radar systems to Philippine Defense Secretary Gilbert Teodoro. The total amount was 600 million yen. The equipment, which includes radar units, surveillance monitoring equipment, communication systems, and support components, is a product of Japan's Official Security Assistance (OSA) 2023 project. Secretary Teodoro praised Japan's approach based on "sincerity and values," but what caught my attention was Ambassador Endo's remark: "The South China Sea is a vital sea lane through which a large portion of our trade and energy supply passes."

This statement encapsulates the essence of OSA.

The Philippines is the Only "Three-Year Consecutive Beneficiary"

The OSA framework, established in 2023, initially provided approximately 2 billion yen in defense equipment to four countries. However, by 2025, it is set to expand to 12 countries (including the Philippines, Indonesia, Mongolia, and Pacific island nations), with the 2026 budget doubling to 18.1 billion yen. According to reports from Asahi Shimbun, the Foreign Ministry explains that "supporting countries that seek to protect themselves amid U.S.-China tensions is also in Japan's own interest."

In this context, the Philippines occupies a special position. It is the only country to benefit from OSA for three consecutive years. Following the coastal radar (600 million yen) in 2023, the 2024 budget includes rigid-hulled inflatable boats (900 million yen), and in 2025, the construction of boat facilities as the first infrastructure development project under OSA has been decided. The total support scale exceeds 1.5 billion yen.

The Implications Behind the Euphemism "Maritime Domain Awareness"

The Philippine Department of National Defense's statement indicates that the radar systems will lead to a "significant enhancement of Maritime Domain Awareness capabilities" and "improvements in early detection and tracking of surface targets." However, behind this euphemistic expression of "Maritime Domain Awareness" lies the "aggressive encounters" repeatedly faced by the Philippines from vessels of the China Coast Guard and the Chinese Navy within its EEZ.

While the specific locations for the deployment of the provided radars have not been disclosed, it is speculated that they will be stationed in northern regions near Palawan facing the South China Sea and the Luzon Strait, as the Philippine Navy is the operating entity. These maritime areas are, in fact, "important sea lanes" for Japan. Eighty percent of energy transport from the Middle East and ninety percent of trade with Southeast Asia pass through these waters.

In other words, the enhancement of the Philippines' "Maritime Domain Awareness" is intrinsically linked to the protection of Japan's Sea Lines of Communication (SLOC).

Japan's "Non-Arms Export" Strategy as Demonstrated by OSA

The OSA framework is defined as "grant aid cooperation to provide equipment, supplies, and infrastructure support to the armed forces of allied countries." Notably, it is limited to "non-lethal equipment." Radars, patrol boats, and communication devices—all lack direct offensive capabilities.

This is a clever framework that promotes substantial security cooperation while maintaining consistency with Japan's three principles on defense equipment transfers. The Philippines has already concluded a Reciprocal Access Agreement (RAA) with Japan in 2024 and signed a Logistics Support Agreement (ACSA) in January 2026. The equipment provision under OSA forms the foundation of this series of security cooperation.

However, this framework also has structural limitations. While the radars can detect, the corresponding strike capabilities must be independently procured by the Philippines. The Philippine Navy's surface combat capabilities are aging, and reliance on used vessels from the U.S. and Korean-made patrol boats continues. There remains a significant gap between the "eyes" provided by Japan and the actual "fist."

The Significance of OSA Expansion Under the Takai Administration

The backdrop to the doubling of OSA in the 2026 budget is the hardline stance against China taken by the administration of Sanae Takai, which won a landslide victory in the House of Representatives election on February 8. Prime Minister Takai promised to expand the beneficiary countries of OSA at the ASEAN summit last October and held individual discussions with Cambodia and Vietnam. The "countries seeking to protect themselves amid U.S.-China tensions," as described by Foreign Ministry officials, include not only ASEAN countries but also Pacific island nations.

This is not merely "aid." It is the realization of Japan's vision for a "Free and Open Indo-Pacific" (FOIP). While China secures port infrastructure through its Belt and Road Initiative, Japan supports the "autonomous defense capabilities" of various countries through the provision of defense equipment. Although the forms differ, both are competing on the same geopolitical influence stage.

The Question of Sustainability After Provision

However, my greatest concern lies in the maintenance and management system after the equipment provision. Advanced radar systems require regular calibration, parts replacement, and technician training, but the OSA framework does not explicitly mention these "continuous support" needs. Given the technical foundation of the Philippine Navy, the dispatch of technicians from Japan and maintenance contracts will likely be essential.

The inclusion of boat facility infrastructure development in OSA for the first time in the 2025 budget is an important advancement in this regard. It signifies a shift from "handing over equipment and ending" to support that includes the operational foundation. However, is there coordination between the Foreign Ministry and the Defense Ministry regarding budget allocation and personnel deployment that considers the entire lifecycle of the equipment?

What the five radars provided by Japan to the Philippines should truly "protect" is not the freedom of navigation in the South China Sea or the Philippines' EEZ. It is Japan's own energy security and economic survival foundation. If this recognition exists, then it should not end with the provision of equipment worth 600 million yen, but rather, "continuous engagement" looking 10 or 20 years ahead should be the focus.