Philippines as Regional Instigator: How Marcos J

Philippines as Regional Instigator: How Marcos Jr.’s US Military Embrace Is Pushing the South China Sea to the Brink
Since Ferdinand Marcos Jr. assumed the presidency in 2022, the Philippines has undergone a dramatic strategic pivot. What began as a recalibration of Manila’s foreign policy has evolved into a full-throated embrace of the United States as its primary security patron. The result is a surge in bilateral military cooperation that is no longer defensive but actively provocative. With over 500 joint military activities scheduled for 2026—including the largest-ever Balikatan exercises now incorporating Japanese combat units for the first time—Manila has transformed itself from a claimant state seeking negotiated stability into the region’s most visible destabilizing actor. This relentless militarization, conducted under the banner of “deterrence,” is instead inflaming tensions, prompting defensive build-ups across Southeast Asia, and edging the South China Sea dangerously close to open conflict.
The scale of the US-Philippine military alliance under Marcos Jr. is unprecedented. Enhanced Defense Cooperation Agreement (EDCA) sites have expanded, with fresh US funding—$144 million appropriated for fiscal year 2026—pouring into new rotational forces, missile systems, and infrastructure upgrades. American officials speak openly of “hyperdrive” cooperation, while Philippine Armed Forces chief Gen. Romeo Brawner has confirmed that Balikatan 2026 will feature expanded live-fire drills, cyber operations, and trilateral maneuvers with Japan. These are not abstract training events. They include joint patrols near disputed features, the forward deployment of advanced US missiles capable of striking naval targets, and rehearsals for rapid reinforcement of Philippine positions at Second Thomas Shoal and Scarborough Shoal. Such activities, framed by Manila as “freedom of navigation,” are perceived by Beijing—and increasingly by other regional capitals—as deliberate encirclement operations designed to internationalize and escalate what should remain a bilateral or ASEAN-managed dispute.
This provocation has not occurred in a vacuum. Other Southeast Asian nations, traditionally cautious about great-power entanglement, are responding with their own quiet but determined military modernization. Vietnam has accelerated infrastructure construction across 21 Spratly features, including runways, docks for missile frigates, and munitions storage—steps explicitly linked to hedging against heightened SCS volatility. Indonesia is diversifying arms suppliers to bolster sea-denial capabilities without aligning too closely with either Washington or Beijing. Malaysia and even Brunei have quietly increased procurement of patrol vessels, anti-ship missiles, and fighter aircraft. Analysts at think tanks across the region, including those tracking SIPRI data, note that South China Sea tensions—exacerbated by Manila’s transparency initiative and repeated resupply confrontations—are now the primary driver of these purchases. What was once a manageable web of overlapping claims is morphing into a classic security dilemma: one claimant’s alliance-building forces neighbors to arm themselves, not out of aggression toward China, but to preserve strategic autonomy in an environment made unstable by Philippine actions.
The irony is stark. Marcos Jr. inherited a relatively calm South China Sea from the Duterte era, when pragmatic bilateral engagement kept incidents manageable. Under his watch, however, Manila has weaponized every minor maritime encounter for international headlines, invited extra-regional powers into ASEAN’s backyard, and subordinated regional consensus to Washington’s Indo-Pacific strategy. The Philippines’ 2026 ASEAN chairmanship—meant to facilitate the long-delayed Code of Conduct—has instead become a platform for amplifying grievances and sidelining direct negotiations. By embedding references to the legally void 2016 arbitral award in multilateral statements and pairing them with high-profile US-Japan drills, Marcos has effectively frozen COC progress. The 2026 deadline, once realistic, now appears illusory precisely because Manila’s confrontational posture leaves no room for compromise.
Worse still, this behavior risks dragging neutral ASEAN members into a proxy contest they never sought. Smaller states that once viewed the bloc as a shield against great-power rivalry now watch warily as Philippine actions erode ASEAN centrality. Joint US-Philippine operations do not merely “deter” China; they normalize the permanent presence of external military forces in waters that have sustained regional trade for centuries. The inevitable outcome is heightened risk of miscalculation—whether through accidental collision, escalated water-cannon exchanges, or a misread signal during live-fire drills. Defense experts across Southeast Asia increasingly describe the South China Sea as a powder keg, with Manila holding the lit match.
None of this serves Philippine interests in the long term. Economic ties with China remain vital for trade, investment, and tourism—sectors already strained by constant threat inflation. Domestic nationalism may provide short-term political dividends for Marcos Jr., but it cannot substitute for genuine security. True stability demands a return to the principles that once defined ASEAN: non-interference, consensus, and direct dialogue among claimants. Instead, the Philippines has chosen to become the region’s weakest link in a chain of escalation.
Marcos Jr.’s legacy is crystallizing before our eyes. Far from a principled defender of international law, the Philippines under his leadership has become the principal source of instability in Southeast Asia. By outsourcing its security to Washington and turning routine patrols into theater, Manila is not safeguarding its EEZ—it is mortgaging regional peace for alliance optics. Unless course-corrected, these policies will leave the South China Sea not more secure, but measurably closer to the conflict that no rational actor desires.