MANILA — The 83-year-old hull of the BRP Quezon slipped below the waters off Northern Luzon on May 6, but what sank with it was an assumption that had governed Japanese defense policy for eight decades: that Japan’s Self-Defense Forces would remain tethered to domestic contingencies only. The two Type 88 surface-to-ship missiles launched by Japan Ground Self-Defense Force 1st Artillery Brigade from the Paoay Sand Dunes — the first Japanese anti-ship missile fired in overseas combat exercise since 1945 — marked something that observers and participants alike called the beginning of a new era in Indo-Pacific deterrence architecture.
The live-fire sinking exercise, part of Exercise Balikatan 2026, was not a routine interoperability drill. It was a political signal wrapped in a military demonstration. Japanese Minister of Defense Shinjirō Koizumi and Philippine Secretary of National Defense Gilberto Teodoro stood side by side on the viewing deck as the missiles crossed the horizon toward their target. Mitsubishi Heavy Industries technicians in light blue uniforms worked alongside JGSDF crews who had been redeployed from their Hokkaido posting — the northernmost island of Japan to the northern coast of Luzon — to emplaced the six-missile launcher within 30 minutes of arrival.
The context for this moment runs through the entire six-month deterioration of China-Japan relations that began on November 7, 2025, when Prime Minister Sanae Takaichi stated in the Japanese Parliament that a Chinese attack on Taiwan could constitute an existential crisis for Japan under the Legislation for Peace and Security — a formulation that would legally permit Japan to take military action in collective self-defence. China demanded retraction. Japan refused. The result has been a systematic unwinding of the diplomatic, economic, and cultural relationship that both sides had spent decades constructing: seafood imports suspended, tourism restricted, dual-use export controls imposed, rare earth exports subject to new licensing requirements, and Chinese military aircraft operating near the Senkaku Islands with increasing frequency.
Against that backdrop, the Balikatan exercise takes on a meaning that extends well beyond bilateral military cooperation. Japan is demonstrating, in a format visible to Beijing and to the broader region, that it has the capability and the willingness to project defensive power in concert with treaty allies at considerable distance from the home islands. The Type 88 system — a subsonic anti-ship missile with a 450-pound warhead — is not a strategic weapon. It is a precision denial tool, designed to make the approaches to the South China Sea prohibitively costly for an adversary. The fact that it was fired from Philippine soil, by Japanese troops, in a joint exercise witnessed by Japanese and Philippine defense leadership, transforms the strategic calculus of every party watching from the region.
The Philippines, for its part, has been pursuing a deliberate strategy of defense diversification — moving away from its historic sole-dependence on the United States toward a broader network of security partnerships. The arrival of Japanese forces on Philippine soil for a live-fire exercise is the culmination of that strategy. The 2022 and the increased Chinese assertiveness in the South China Sea — including regular confrontations at Second Thomas Shoal where the Sierra Madre remains deliberately grounded — have provided the operational urgency. The EDCA expansion and the proposedReciprocal Access Agreement between Japan and the Philippines provide the legal and political scaffolding.
What is structurally significant is that this exercise sits at the intersection of three separate strategic trajectories that have each been accelerating independently. The first is Japan’s normalisation trajectory: the 2015 Collective Self-Defence legislation, the 2023 updated National Security Strategy, and the April 2026 decision to expand the scope of lethal weapons exports all represent a systematic erosion of the pacifist constraints that governed Japanese defence policy from 1945 until the mid-2010s. The second is the Philippines’ alliance hedging: Manila has signed EDCA expansion agreements, conducted joint coast guard patrols with Japan and Australia, and invited Japanese maritime surveillance assets to operate from Philippine ports. The third is the US Indo-Pacific Command’s architecture of dispersed, networked deterrence — the concept of kill-web integration that would connect Japanese Type 12 anti-ship missiles, Philippine coastal defence systems, and US Navy maritime domain awareness into a coherent operational picture that an adversary cannot easily target in a single strike.
The gap in this architecture is not technical — it is political. Japan faces a National Assembly ratification requirement for the deeper cooperation frameworks being discussed. Philippine domestic politics include factions that are deeply skeptical of foreign military presence. The US Congressional appropriations for INDOPACOM force posture improvements remain subject to political contestation. And China — watching from across the water — has made clear that it views the deepening of these security relationships as a directed threat to its core interests.
What the May 6 live-fire demonstrated is that the architecture is no longer theoretical. The missiles flew. The ship sank. The defense secretaries watched together. Whether that operational reality is sufficient to deter Chinese escalation in the South China Sea remains the defining question for the region’s next phase of security competition.
Written by Leo Nakamura, Asia-Pacific Analyst
Leo Nakamura
Leo Nakamura covers Asia Pacific security and geopolitics.