Japan and Philippines Prepare Military Access Pact as Manila Seeks Ships, Radars and Closer Defense Ties

A new pact moves defense cooperation toward practical action

The Philippines and Japan are preparing to bring a Reciprocal Access Agreement into force, opening the way for larger military exercises as Manila seeks Japanese radars, unmanned systems and shipbuilding expertise. As of September 9, 2025, both governments have approved the pact, while discussions on equipment include up to six Japanese destroyer escorts and basic maritime patrol aircraft, with deliveries possible as early as 2027 if Manila proceeds.

The partnership is expanding from periodic training and equipment transfers into cooperation covering military access, defense industry, intelligence and supplies. For the Philippines, the immediate task is to improve its ability to watch contested waters, keep vessels operating and respond to pressure from Chinese coast guard and militia ships around Philippine reefs and shoals.

The difference in resources is substantial. The China Coast Guard operates well over 100 large patrol ships, compared with roughly two dozen major vessels in the Philippine Coast Guard. Philippine air and maritime surveillance also remains thin across a vast archipelago. Manila's modernization program, running over 15 years, has begun delivering improvements, but many platforms remain outdated and budgets are tight.

Tokyo brings equipment, financing and technical experience. Manila brings a strategic location along sea routes connecting the South China Sea, Luzon and Taiwan with Japan's southwestern islands. Both governments want better maritime awareness, greater ability to withstand disruption and stronger deterrence, meaning the capacity to discourage hostile action by making it more costly.

Their stated purpose is to protect peace and stability while leaving room for diplomacy. Turning that ambition into reliable capability will require more than agreements: crews need training, ships need spare parts, and forces need compatible communications and dependable supplies.

What the access agreement changes

The Reciprocal Access Agreement, known as the RAA, establishes a legal framework for troops to deploy for training and exercises in each other's territory, waters and airspace. It covers the status of visiting personnel, movement of equipment and jurisdiction, including which country's authorities handle legal matters involving visiting forces.

The legal framework matters in the Philippines because its 1987 constitution bars permanent foreign bases and a prolonged foreign troop presence, while allowing visits and training under treaties. The arrangement is intended to support military activities without establishing permanent foreign bases.

Japanese participation in Philippine exercises has largely been limited to disaster relief activities. The new rules would permit a wider range of scenarios, including live drills at sea and in the air, amphibious training, air defense practice and more advanced humanitarian and disaster response exercises.

Amphibious training involves moving forces between sea and land. Practising such operations, alongside air defense and emergency response, helps personnel learn how to coordinate across different services and countries. The goal is interoperability: forces being able to communicate, share procedures and work together during a crisis.

Japan already has comparable access agreements with Australia and the United Kingdom. Its agreement with the Philippines is its first with a Southeast Asian partner, marking another step in relations since diplomatic normalization in 1956. For Manila, it sits alongside its visiting forces agreement with the United States and its training arrangement with Australia, supporting faster responses and smoother logistics.

Why Manila is looking to Japanese technology

Philippine military spokesperson Col. Francel Margareth Padilla has linked closer cooperation with Japan to the modernization drive, expanded joint activities and stronger defense industrial ties. She identified several areas where Manila sees particular value in Japanese experience.

We are looking into closer cooperation with Japan, as we see significant potential in this. We are particularly interested in Japan's expertise in areas such as radar and unmanned systems, as well as shipbuilding.

Radars can help crews detect and track activity over wider areas. Unmanned systems can contribute to surveillance, while shipbuilding cooperation can support the vessels needed to patrol a large maritime territory. Together, these priorities address the practical problem of seeing what is happening at sea and having enough working assets to respond.

Japanese defense minister Gen Nakatani visited the Philippines to launch a strategic dialogue involving senior officials and new equipment discussions. He presented cooperation as a response to worsening security conditions in the East and South China seas.

The security environment is becoming increasingly severe, and it is necessary for our two countries, as strategic partners, to enhance defense cooperation and collaboration to maintain peace and stability in the Indo Pacific.

For Philippine planners, radar networks supported by partners, training for unmanned systems and more capable patrol vessels could deliver useful gains while larger purchases work through approval and funding processes. Those improvements would help address gaps left by years of underinvestment.

Patrol ships, coastal radars and possible naval transfers

Japan has financed and delivered vessels with multiple response roles to the Philippine Coast Guard over the past decade, as well as supplying coastal surveillance radars. The Philippines was also the first recipient of Japan's Official Security Assistance, a program providing defense equipment to countries with similar security interests to improve awareness of activity at sea.

Japanese loans are financing five larger patrol ships in the pipeline for the coast guard. Japan's security assistance and development lending together support a wider maritime effort involving new large cutters and projects that improve the ability to detect and follow vessels.

Naval discussions go further. Officials are studying a possible transfer of up to six destroyer escorts from the Japan Maritime Self Defense Force, together with basic maritime patrol aircraft. The ship discussions include Abukuma class escorts commissioned in the 1990s, with upgrades tailored to Philippine requirements.

Destroyer escorts would add naval capacity, while patrol aircraft could help cover waters beyond the reach of individual ships. The possible deliveries depend on Manila proceeding and on approvals and budgets aligning. The earliest delivery period under discussion is 2027.

Japan has also agreed to provide rigid hull inflatable boats and additional coastal radar systems. These are intended to strengthen coverage around important choke points, where vessels pass through constrained routes, and along resupply routes in the West Philippine Sea.

For Manila, the package addresses surveillance, patrol and logistics shortages. It also creates a need for lasting arrangements with Japanese industry for maintenance, training and support throughout the equipment's service life.

Keeping new equipment ready for service

Japanese defense manufacturers could gain new markets and service contracts through closer cooperation with the Philippines, at a time when domestic demand can be unpredictable. Tokyo also sees support for Philippine maritime capacity as part of maintaining a stable regional order.

Some support work could be based in the Philippines, helping develop local skills and shorten repair times. That would connect equipment transfers with defense industrial cooperation, giving Manila more capacity to maintain assets rather than relying entirely on work performed abroad.

Maintenance is a practical part of the modernization challenge. A patrol ship needs trained crews, working systems and replacement parts to remain available. As new platforms arrive, training, spare parts pipelines, maintenance and participation by local industry will become central measures of whether the partnership delivers lasting gains.

Manila's limited budget and competing priorities make these continuing costs important. Radar deployments and inflatable boats are advancing sooner than the larger potential naval transfers, offering improvements while more expensive decisions remain under review.

Intelligence and supplies are the next building blocks

Japanese and Philippine defense leaders have launched a strategic dialogue between their militaries and agreed to expand joint and multinational training, port visits and information sharing. These arrangements connect policy discussions with the everyday procedures forces need during exercises and emergencies.

Two further agreements are in view. A general security of military information agreement, or GSOMIA, would allow the protected exchange of highly classified information between Japan's Self Defense Forces and the Armed Forces of the Philippines. Such an agreement sets rules for handling sensitive information shared by the two sides.

A logistics agreement would allow the countries to provide each other with fuel, food and other supplies during exercises and contingencies. Reliable resupply helps keep forces operating when an activity lasts longer than expected or conditions change quickly.

Japanese leaders are preparing for a summit that could secure these steps and expand the use of Japan's security assistance for the Philippines. As of September 9, no exact date was given for the RAA to take effect, the first major exercises under it, or completion of the intelligence and logistics agreements.

Why Luzon, Taiwan and Japan's islands matter

The Philippines and Japan sit along a strategic arc running from the South China Sea past Luzon and Taiwan to the Ryukyu chain. Philippine bases in northern Luzon are close to Batanes, while Japan's southwestern islands lie near Taiwan and the East China Sea.

Training to move forces and coordinate sensors across this area could improve awareness and shorten response times during a crisis. Sensors are the equipment, including radars, that detect activity. Connecting the information they gather can help forces develop a more complete picture than any single ship or station could provide.

Manila and Tokyo are also watching for consequences of a possible Taiwan crisis because Philippine and Japanese facilities are near the Taiwan Strait. Joint training, compatible logistics and common operating procedures would matter if either country needed to assist its ally, the United States, or protect its own citizens and sea lanes.

Japan, the Philippines and the United States have built a trilateral channel to coordinate activity at sea and in the air. This gives the three governments another way to align their work as military cooperation increasingly connects several partners rather than operating only through separate relationships.

Dangerous encounters keep the focus on contested waters

Second Thomas Shoal and Scarborough Shoal remain central to Manila's security concerns. Chinese coast guard and militia vessels have routinely used water cannons and aggressive maneuvers to block Philippine resupply missions.

A recent collision near Scarborough involved Chinese navy and coast guard vessels. A Chinese helicopter also reportedly flew within meters of a Philippine surveillance aircraft near the shoal. Such encounters create immediate risks for the personnel operating ships and aircraft in the area.

An arbitral tribunal in The Hague ruled in favor of the Philippines in 2016 and rejected China's expansive claim. Incidents at sea have continued despite that ruling.

Better radars, aircraft and communications that work across different forces can help Philippine crews document and publicize coercive behavior. Combined patrols and coordinated exercises are also intended to increase the risks faced by a potential aggressor.

The equipment and access discussions therefore have a direct connection to daily operations. Philippine personnel need to track approaching vessels, communicate reliably and maintain the ships used for patrol and resupply. Cooperation with Japan is intended to improve those capabilities while larger modernization projects progress.

Sovereignty, wartime history and escalation concerns

Some Philippine groups warn that increased foreign military activity could weaken sovereignty. Lawmakers on the left have argued that expanded access for Japanese forces risks repeating past injustices and gives insufficient weight to wartime trauma.

Other voices support cooperation while seeking stronger protections governing visiting personnel and greater transparency around exercises and equipment transfers. Their concerns put attention on how the agreements will operate in practice, including the rules applied to foreign troops.

Japanese policymakers point to seven decades of peace, democratic accountability and a defense posture focused on collective security. Supporters in Manila present the partnership as a response to a harsher security environment, rather than an attempt to rewrite history.

Beijing is likely to see the RAA and related cooperation as an effort to restrict its influence. That perception carries the risk of reciprocal actions at sea that could make already tense encounters more dangerous.

Manila and Tokyo are coupling defense cooperation with diplomatic outreach. Clear communication channels, crisis hotlines and regular coast guard talks can reduce miscalculation. Transparent exercises and public briefings about deployments can also address domestic concerns and signal restraint to rivals.

A wider network, with practical milestones ahead

Japan and the Philippines both have defense treaties with the United States. Washington's regional alliances traditionally operated through a hub and spokes model, with the United States at the center of separate relationships. Closer ties between Manila and Tokyo connect those partners directly, reducing dependence on a single relationship and improving their ability to handle simultaneous challenges.

Manila has expanded access for US forces through the Enhanced Defense Cooperation Agreement. Tokyo works closely with Washington on missile defense, undersea tracking and logistics. Australia trains with both Japan and the Philippines and has its own access agreement with Japan.

Exercises involving coast guards, maritime law enforcement agencies and navies are becoming routine. They support maritime awareness, coordination of air and sea operations during emergencies, and a shared response to coercion. The United Kingdom and South Korea are also engaging more often, widening the training opportunities and specialist capabilities available to Manila and Tokyo.

The partnership's development and expected milestones span several periods:

• 1956: Japan and the Philippines normalized diplomatic relations.
• 1987: The Philippine constitution established the restrictions on foreign bases and troop presence that frame access arrangements.
• 2016: The arbitral tribunal in The Hague ruled in favor of the Philippines and rejected China's expansive claim.
• September 9, 2025: Both governments have approved the RAA and are preparing to bring it into force, alongside wider equipment and cooperation discussions.
• Within months of implementation: Officials are expected to announce the first major exercises under the new framework.
• As early as 2027: Transfers of Japanese destroyer escorts and basic maritime patrol aircraft could begin if Manila proceeds and approvals and budgets align.

Over the next two years, the expected focus is on larger and more frequent exercises in Philippine and Japanese training areas, progress toward protected information sharing and mutual resupply, and decisions on possible naval transfers. More multinational drills involving the United States and Australia, expanded sharing of maritime and air information, and closer attention to northern Luzon and Japan's southwestern islands are also expected.

For Manila, the practical test will be whether agreements produce working radars, available vessels, trained crews and reliable support. Budget constraints remain, but the cooperation has defined steps that could improve the Philippines' ability to watch and operate in contested waters.

Key Points

• Japan and the Philippines have approved a Reciprocal Access Agreement and are preparing to bring it into force.
• The pact provides rules for visiting forces and allows broader training without permanent foreign bases.
• Manila seeks Japanese expertise in radars, unmanned systems and shipbuilding to address surveillance and patrol shortages.
• Japanese loans are financing five larger Philippine Coast Guard patrol ships, while boats and additional coastal radars are advancing.
• Up to six Japanese destroyer escorts and basic maritime patrol aircraft are under discussion, with possible deliveries from 2027.
• Protected information sharing and mutual resupply agreements are further goals.
• Maritime confrontations, sovereignty concerns, wartime history and escalation risks remain central to the partnership's development.
• Training, maintenance, spare parts and local industrial participation will determine how reliably new equipment can operate.