What It Is
The US-Japan-Philippines Trilateral is a 2024-launched trilateral between the US, Japan, and the Philippines focused on South China Sea security cooperation. The first US-Japan-Philippines leaders' summit was held at the White House on 11 April 2024 between President Biden, Japanese PM Kishida, and Philippine President Marcos.
The framework responds to escalating Chinese coast guard pressure on Philippine forces around Second Thomas Shoal and other contested features in the South China Sea. The 2023–24 episodes — Chinese water-cannon attacks on Philippine resupply vessels, dangerous maneuvers near Philippine coast guard ships — created the political momentum for trilateral coordination.
Outcomes from the First Summit
Outcomes include:
- Trilateral maritime cooperation including joint exercises in the South China Sea.
- Expanded US-Philippines defense cooperation under EDCA (Enhanced Defense Cooperation Agreement), including additional US-accessible facilities in the Philippines.
- Japanese ODA for Philippine coast guard capacity-building including vessels, equipment, and training.
- Trilateral economic engagement through the Luzon Economic Corridor, a new framework for development cooperation in Northern Luzon and around US/Japan-supported infrastructure projects.
- Reciprocal Access Agreement (RAA) between Japan and the Philippines, completed in 2024, allowing Japanese forces to operate in the Philippines under defined conditions.
Why It Matters
The framework complements the existing US-Philippines bilateral alliance (under the 1951 Mutual Defense Treaty) and Japan-Philippines defense cooperation. Like the , it represents the proliferation of 'minilateral' groupings combining bilateral alliances into trilateral coordination.
The trilateral matters because the South China Sea is one of the most active flashpoints in the Indo-Pacific. Chinese maritime militia and coast guard pressure on the Philippines has been sustained and escalating since at least 2022. The trilateral framework gives the Philippines additional diplomatic and operational support that pure bilateral relationships could not provide.
How It Fits into the Lattice
The US-Japan-Philippines trilateral is one element of the broader 'lattice' strategy in the Indo-Pacific. It sits alongside:
- Camp David trilateral: US-Japan-South Korea.
- : US-UK-Australia.
- Quad: US-Japan-Australia-India.
- US-Japan-Australia-Philippines quadrilateral (under development).
- US-Japan-Korea-Philippines coordination (in informal exploration).
The density of these minilateral groupings is itself the lattice's strategic substance.
Critiques and Challenges
The framework faces ongoing challenges:
- Sustainability across administrations: a future US or Philippine administration could de-emphasize the framework.
- Implementation pace: announced cooperation has been slow to operationalize.
- Escalation risk: deepening US and Japanese engagement raises Chinese perception of encirclement and could escalate Sino-American tensions.
- Philippines domestic politics: opposition figures in Manila have criticized the deepening security ties with Washington as compromising Philippine strategic autonomy.
Real-World Examples
The 2024 EDCA expansion added four additional US-accessible facilities in the Philippines, including in Northern Luzon facing Taiwan. The 2024 Japan-Philippines RAA was the first such agreement Japan has signed with an Asian partner. The South China Sea joint patrols (2024–26) have demonstrated the framework in practice.
Example
The April 2024 trilateral summit's commitment to joint maritime exercises in the South China Sea materialized in subsequent multilateral drills involving the three plus Australia — the first such operations explicitly framed as trilateral.