Signing Ceremony of the ASEAN Treaty on Extradition at BGC, Philippines on Nov. 2025 | Screengrab YouTube via RTVM
In diplomacy, moments of convergence are rare – and when they do occur, they must be recognized not only for what they represent, but for what they demand.
Last Monday, I was a speaker at the Sasakawa Peace Foundation here in Washington, where policymakers and thought leaders gathered to examine what is fast becoming one of the most consequential strategic developments in our region: the deepening trilateral cooperation among the Philippines, the United States, and Japan. What began as a natural alignment of interests has now evolved into something far more significant – a pillar of the emerging security and economic architecture of the Indo-Pacific.
From Manila’s perspective, this evolution is both logical and necessary. Our alliance with the United States is anchored in decades of shared history and reinforced by the 1951 Mutual Defense Treaty, now marking its 75th anniversary. On the other hand, our partnership with Japan, once defined by a difficult past, has matured into one of our most trusted and forward-looking relationships, now 70 years since normalization. This year also marks 80 years of diplomatic relations between the Philippines and the US – an enduring testament to the strength of our alliance.
These milestones are not simply ceremonial – they reflect a depth of trust that now allows us to move beyond bilateral ties and into a more integrated, trilateral framework.
At the leadership level, this convergence is unmistakable. President Ferdinand Marcos Jr. has engaged both President Donald Trump and Japanese Prime Minister Sanae Takaichi, reinforcing a shared commitment to closer coordination. This alignment has been echoed in US-Japan engagements, where cooperation with the Philippines has been explicitly recognized and reaffirmed.
However, diplomacy cannot rest on statements alone. The true measure of this trilateral partnership lies in its ability to deliver on security, economic resilience, and the preservation of a rules-based international order.
In the maritime domain, the stakes are clear. The West Philippine Sea remains a focal point of regional tension, where the principles of freedom of navigation and respect for international law continue to be tested. Here, trilateral cooperation is already moving from concept to action.
Joint maritime activities are expanding. The Reciprocal Access Agreement with Japan opens the door to deeper operational coordination, including increased Japanese participation in exercises such as Balikatan. The Philippines has also expressed readiness to host the next Trilateral Maritime Dialogue – a practical step toward institutionalizing cooperation at sea.
These are not abstract initiatives but concrete mechanisms designed to enhance deterrence, strengthen interoperability, and ensure that the seas connecting our nations remain open and secure.
“It is particularly important as the Philippines assumes a leadership role in the region. As ASEAN chair, we are committed to ensuring that this trilateral initiative complements – not competes with – broader regional frameworks. Inclusivity, transparency, and respect for ASEAN centrality must remain guiding principles.
Yet security alone does not define this partnership. Equally important is economic security, where the Luzon Economic Corridor stands out as a flagship initiative. Linking Subic, Clark, Manila, and Batangas, this corridor is envisioned as a backbone for infrastructure, investment, and supply chain resilience.
Initial support has been encouraging. The US has provided funding for pre-feasibility studies of a critical freight railway, while other partners are expressing interest. But let’s be candid: for the corridor to realize its full potential, ambition must be matched by sustained investment and long-term commitment.
In many ways, the LEC will serve as a litmus test. Can trilateral cooperation move beyond declarations into large-scale, tangible outcomes that benefit Filipinos? That is the challenge before us.
There are other areas where this partnership must deepen. Cybersecurity, digital cooperation, countering foreign information manipulation, and addressing economic coercion are no longer peripheral concerns – they are central to national resilience.
The complementarity of the three countries is our greatest strength.
The US brings unmatched security capabilities and global reach; Japan contributes deep expertise in infrastructure development and technological innovation; the Philippines offers strategic geography, a dynamic economy, and a firm commitment to a rules-based international order. Together, they represent not just alignment, but synergy.
Yet even synergy requires structure. If this trilateral partnership is to endure, it must be institutionalized. Regular dialogues at the ministerial level must be sustained, coordination mechanisms strengthened, and, above all, continuity ensured – ensuring that progress is driven not by personalities but by a shared purpose.
It is particularly important as the Philippines assumes a leadership role in the region. As ASEAN chair, we are committed to ensuring that this trilateral initiative complements – not competes with – broader regional frameworks. Inclusivity, transparency, and respect for ASEAN centrality must remain guiding principles.
Here in Washington, one can sense a clear recognition that the Indo-Pacific is entering a more demanding phase, where partnerships will be judged not by intent, but by execution. The conversations are no longer about whether cooperation is desirable, but whether it is being delivered at the scale and speed required.
That is the test now facing the Philippines, the United States, and Japan.
The task before us is straightforward: to convert alignment into execution, commitments into capabilities, and vision into results. It will require sustained political will, adequate resources, and a shared understanding that what we are building is not temporary, but foundational.
Obviously, it’s not easy. But if we succeed, this trilateral partnership will stand as one of the most effective models of strategic cooperation in the Indo-Pacific – proof that like-minded nations can act with both purpose and practicality.
But if we fall short, we risk adding one more well-intentioned framework to a region that has no shortage of them. In the end, the measure of this partnership will not be found in communiqués or conferences. It will be seen in ships that sail freely, in supply chains that hold firm, and in a region that remains stable, open, and secure.
Because in today’s Indo-Pacific, credibility is not declared – it is delivered.
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