Regional Affairs — Asia-Pacific
On May 20, 2026, the Philippine Department of National Defense issued a blunt rejection of Beijing’s latest protest, affirming that construction and development activities on Thitu Island — known in the Philippines as Pag-asa — and Nanshan (Lawak) Island are lawful exercises of Philippine sovereignty. China’s Ministry of National Defense had claimed the activities violated Chinese sovereignty and demanded their cessation. Manila’s response was unambiguous: the buildings stand, the work continues, and the legal basis for Philippine presence rests on a ruling Beijing refuses to acknowledge but cannot erase.
The confrontation over Pag-asa Island is the South China Sea dispute in miniature. At 44 square kilometers, Thitu is the largest of the Philippine-occupied features in the Spratly Islands, habitable, and equipped with a 1,300-meter airstrip capable of handling military transport aircraft. Its position 300 kilometers west of Palawan places it adjacent to the Reed Bank — an area of significant oil and gas potential and a zone Manila regards as falling squarely within its exclusive economic zone under the United Nations Convention on the Law of the Sea. Control of Pag-asa gives the Philippines a legitimate legal standing in waters China claims almost entirely through its sweeping nine-dash line doctrine, a claim that a 2016 arbitral tribunal constituted under UNCLOS found to have no basis in international law.
The Permanent Court of Arbitration’s 2016 decision remains the most powerful legal instrument the Philippines holds — and the most ignored. The tribunal ruled that China’s nine-dash line claim to historic rights over waters within 200 nautical miles of its mapped line had no basis in UNCLOS, that China’s large-scale land reclamation and construction activities in disputed waters had caused severe environmental damage, and that Philippine vessels had the right to resupply and maintain their personnel on Second Thomas Shoal without interference. Beijing rejected the award within hours and has refused to acknowledge it ever since.
Yet the ruling has not disappeared. Philippine Defense spokesman Arsenio Andolong cited it directly in the May 20 statement, declaring that the award “remains final and legally binding on the parties.” That language matters — it is a direct challenge to Beijing’s strategy of burying the ruling through persistent physical presence and diplomatic fatigue. ambers.
Beijing’s response to Philippine construction follows a pattern now well-established across the South China Sea: diplomatic protest, coast guard deployment, and maritime militia positioning — in that order, and usually below the threshold of direct armed confrontation. The Chinese Ministry of National Defense issued its statement; Chinese coast guard vessels maintain persistent presence near contested features; and the fishermen’s boats that operate as a gray-force appendage to the official navy continue their activities in areas Manila regards as its sovereign waters.
This is the three-line strategy in practice. The first line — diplomatic protest — costs Beijing nothing and creates a record of objection. The second line — coast guard presence — signals physical resistance without crossing into open conflict. The third line — maritime militia — provides plausible deniability while accomplishing what official forces cannot. The pattern has been applied at Scarborough Shoal since 2012, at Second Thomas Shoal where the BRP Sierra Madre remains deliberately grounded, and now at Pag-asa Island where Philippine engineers are extending the runway and building new housing for garrison personnel.
The strategy’s limitation is also its defining feature: it stops short of kinetic action. Beijing protests, positions assets, and waits — calculating that incremental pressure will eventually erode Philippine resolve or the political will of smaller ASEAN member states to maintain their positions. The problem for Beijing is that Manila has, under both the Duterte and Marcos administrations, demonstrated a consistent refusal to be pressured into withdrawal. The construction on Pag-asa in May 2026 is not a new departure; it is the continuation of a policy that has outlasted multiple Philippine administrations and shows no sign of reversing.
The South China Sea dispute plays out against the backdrop of ASEAN’s ongoing failure to finalize a binding Code of Conduct with China. Negotiations have been underway since 2002, progressing through memoranda of understanding and framework agreements, yet the document remains aspirational rather than enforceable. The fourth round of “single draft text” consultations continues; ASEAN spokespeople express “encouragement” at progress; legal experts note that without enforcement mechanisms, any signed COC would function as political signal rather than legal constraint.
The structural problem is well-documented. ASEAN’s consensus requirement means any single member state — historically Cambodia or Laos, both of which maintain economic relationships with Beijing that create diplomatic caution — can dilute or delay the bloc’s formal positions. China exploits this by conducting bilateral negotiations that produce favorable outcomes for individual ASEAN states while leaving the collective position weak. The result is a South China Sea where no binding rules govern behavior, where the 2016 arbitral ruling exists but cannot be enforced, and where Philippine construction proceeds under the protection of legal right rather than collective security guarantees.
Manila has responded by deepening bilateral security partnerships that compensate for ASEAN’s structural limitations. The Enhanced Defense Cooperation Agreement with the United States places American forces within striking distance of contested waters; Japan’s provision of coast guard vessels and defense equipment signals a broader Indo-Pacific commitment; and the Balikatan exercises have expanded to include live-fire missile testing from Philippine territory for the first time since World War II. This layered deterrence model — legal basis, bilateral partnerships, and great-power backing — is how the Philippines manages a dispute it cannot win through ASEAN consensus alone.
Pag-asa Island is not merely a territorial feature. It is a test case for whether international law, when rejected by a greater power, retains any operational force in the region. The construction underway in May 2026 answers that question in practice: the ruling persists, even if unenforced. China continues to protest; the Philippines continues to build; the coast guard vessels continue their rotating presence; and the international legal framework continues to exist as a basis for legitimacy that Beijing cannot dismantle through protest alone.
The risk is that this managed status quo carries its own dangers. China’s coast guard fleet — officially over 200 vessels, the largest in the world — dwarfs the maritime capabilities of all Southeast Asian claimant states combined. Gray-force maritime militia boats operate with official coordination and plausible deniability. The construction on Pag-asa extends Philippine presence but also deepens Chinese attention. Every new runway, every reinforced barracks, every extended logistics chain is a provocation Beijing has chosen not to answer with kinetic force — but whose accumulation may, at some threshold, make the diplomatic and legal cost of non-response higher than the cost of action.
The South China Sea will not be resolved ternational law, against a power that rejects that law but has not yet found it worth the cost to physically prevent it. In that space between protest and action — between China’s position and Manila’s determination — the regional order is being written, one construction project at a time.