China–Philippines relations are defined, more than anything else, by a territorial dispute in the South China Sea that has oscillated between tense standoffs and cautious diplomacy for decades. The two countries maintain formal diplomatic and trade ties, but overlapping sovereignty claims over reefs, shoals, and surrounding waters have made the relationship one of the most volatile in Southeast Asia. What makes it especially interesting is how dramatically Philippine policy toward Beijing has swung with each change of president, from legal confrontation under Benigno Aquino III, to a deliberate embrace under Rodrigo Duterte, to a sharp reversal under Ferdinand Marcos Jr.
The South China Sea as the Central Flashpoint
The heart of the tension is a stretch of water known internationally as the South China Sea and within the Philippines as the West Philippine Sea. China claims historical rights over most of the sea under what it calls the “nine-dash line,” a boundary that sweeps deep into waters the Philippines considers its exclusive economic zone. The disputed features include Scarborough Shoal, roughly 120 nautical miles off the Philippine coast, and the Spratly Islands, a scattered chain of reefs and atolls where both countries (along with Vietnam, Malaysia, Brunei, and Taiwan) maintain competing presences.
The most consequential legal event in the dispute came in 2016, when an international arbitral tribunal ruled overwhelmingly in the Philippines’ favor, finding that China’s nine-dash line had no basis in international law. China rejected the ruling and has never accepted it. That rejection has been the backdrop for every diplomatic exchange since: the Philippines holds a landmark legal victory that the other side treats as irrelevant, and neither country has a clear path to resolving the gap.
On the water, the friction is physical. Chinese coast guard and maritime militia vessels routinely shadow Philippine ships near contested features. The most persistent flashpoint in recent years has been Second Thomas Shoal, where the Philippines deliberately grounded a rusting warship in 1999 to mark its claim. Philippine marines still live aboard the vessel, and China has repeatedly tried to block resupply missions with water cannons and close-quarters maneuvering. These confrontations, often captured on video by Philippine military crews, have become the public face of the dispute.
Environmental Damage from Island-Building
Beginning around 2013, China undertook a massive campaign of dredging and land reclamation in the Spratly Islands, turning submerged reefs and small rock features into artificial islands with airstrips, radar installations, and military facilities. The construction was extraordinary in scale and speed, and the environmental consequences have been documented by satellite data.
A study analyzing satellite-derived ocean health indicators around the construction sites found that dredging activities led to a measurable decline in the biological health of the surrounding waters. The damage came from smothering natural reef habitats and benthic ecosystems with sediment churned up during construction.
1Scientific Reports. Evidence of Environmental Changes Caused by Chinese Island-BuildingCoral reefs in the South China Sea support fisheries that millions of people in the Philippines and neighboring countries depend on for food and income. The destruction of reef complexes does not just damage an abstraction called “the marine environment”; it undermines the livelihoods of Filipino fishing communities who have worked these waters for generations. For many Filipinos, the island-building campaign is not primarily a legal or geopolitical issue but a direct threat to how they feed their families.
The environmental dimension also complicates any future negotiation. Even if the territorial question were somehow resolved, the ecological damage to dredged reefs is largely irreversible on any human timescale. Coral recovery after severe physical disruption takes decades under ideal conditions, and ongoing military activity on the artificial islands means conditions are far from ideal.
The Duterte Years and the Pivot Toward Beijing
When Rodrigo Duterte won the Philippine presidency in 2016, he inherited the arbitral ruling, a powerful legal tool his predecessor had spent years pursuing. He chose not to use it. Instead, Duterte executed one of the sharpest foreign policy pivots in modern Philippine history, deliberately moving the country away from the United States and toward China.
The shift was as personal as it was strategic. Duterte publicly insulted U.S. President Barack Obama at an ASEAN summit, declared the Philippines would “divorce” the United States, and announced he would form alliances along “different ideological lines” with China and Russia. He moved to end joint military exercises with U.S. forces and restrict the U.S. Navy’s use of Philippine ports for South China Sea operations.
2Contexto Internacional. Duterte’s Pivot to China, and Prospects for Settling the South China Sea DisputesThe calculation behind the pivot was not purely ideological. Duterte’s government pursued what analysts describe as a hedging strategy: limit the country’s traditional alignment with Washington while courting Chinese investment and diplomatic goodwill. The approach was believed to serve the regime’s short-term goals, even as the underlying alliance with the United States remained largely intact through existing agreements and institutional ties that proved harder to dismantle than Duterte’s rhetoric suggested.
3Pacific Focus. Nexus of Strong Presidentialism and Philippine Foreign Policy: The Case of the Duterte Presidency’s Hedging toward ChinaChina, for its part, rewarded the friendlier posture with billions of dollars in pledged infrastructure investment and development aid. Duterte’s government emphasized the success of stabilizing relations with Beijing, presenting the warmer ties as a pragmatic alternative to the confrontational approach of the previous administration. Whether the promised investment fully materialized is a separate and contested question, but the diplomatic thaw was real and visible.
4Pacific Focus. Nexus of Strong Presidentialism and Philippine Foreign Policy: The Case of the Duterte Presidency’s Hedging toward ChinaMarcos Jr. and the Return to Confrontation
Ferdinand Marcos Jr., who took office in June 2022, initially seemed inclined to continue his predecessor’s softer approach. He maintained cordial diplomatic and economic contacts with Beijing and appeared open to continued engagement. But the posture did not last. When Chinese assertiveness at sea showed no sign of diminishing, Marcos shifted to what researchers describe as a hard-balancing policy, a significant departure from the Duterte era.
5Journal of Current Southeast Asian Affairs. Exploring the Philippines’ Evolving Grand Strategy in the Face of China’s Maritime Expansion: From the Aquino Administration to the Marcos AdministrationThe Marcos government’s South China Sea strategy has been notably multi-layered. The Philippines has pursued what analysts call a diversified approach: strengthening multilateral military cooperation with the United States, reinvigorating the 2016 arbitral ruling as a diplomatic tool, and deploying what amounts to a transparency campaign by publicizing Chinese actions at sea through official video releases and media briefings.
6Marine Policy. The Logic of the Marcos Jr. Government’s South China Sea PolicyThat transparency strategy has been one of the more novel elements. Under previous administrations, incidents at sea were often kept quiet or downplayed to avoid escalation. The Marcos government has taken the opposite approach, releasing footage of Chinese coast guard vessels using water cannons against Philippine resupply boats and allowing journalists to embed on contested missions. The aim is to generate international sympathy and pressure, essentially litigating the dispute in the court of global public opinion rather than relying solely on legal or diplomatic channels.
Marcos has also vigorously supported the modernization of the Philippine military, which has historically been one of the weakest in the region. New acquisitions of patrol vessels, radar systems, and coastal defense capabilities represent an effort to close the enormous gap between Philippine and Chinese naval capacity, even if full parity remains out of reach.
7Journal of Current Southeast Asian Affairs. Exploring the Philippines’ Evolving Grand Strategy in the Face of China’s Maritime Expansion: From the Aquino Administration to the Marcos AdministrationThe Emerging Trilateral Security Architecture
One of the most significant structural changes in the region has been the formation of a trilateral security partnership among the United States, Japan, and the Philippines. What began as a set of bilateral relationships has evolved into a coordinated three-way arrangement, formalized at the highest level with a summit in Washington in April 2024.
8Конфликтология / nota bene. Military-technical cooperation between the USA, Japan, and the PhilippinesThe partnership reflects a broader strategic logic: all three countries view Chinese military-political pressure in the South China Sea as a shared concern. For the Philippines, the trilateral arrangement provides access to military technology, training, and diplomatic support that it could not generate on its own. For the United States and Japan, closer ties with the Philippines help sustain a network of security relationships across the first island chain, the arc of islands running from Japan through Taiwan and the Philippines that forms a natural geographic barrier between the Chinese mainland and the open Pacific.
The trilateral cooperation is supported by specific military, economic, and infrastructure initiatives rather than being purely declarative. Joint exercises, intelligence sharing, and defense equipment transfers have all increased under the arrangement. Japan’s involvement is particularly notable because Japan’s postwar foreign policy long avoided overt security commitments outside its immediate neighborhood. The willingness to formalize a defense partnership with the Philippines signals how much the regional security environment has shifted.
9Конфликтология / nota bene. Military-technical cooperation between the USA, Japan, and the PhilippinesChina views this trilateral arrangement as precisely the kind of containment strategy it has long warned against, and the partnership’s deepening has added another layer of friction to Beijing-Manila relations. From China’s perspective, the Philippines is allowing itself to become a staging point for American and Japanese efforts to constrain Chinese power. From Manila’s perspective, the partnership is a rational response to a much larger neighbor that has been unwilling to respect either international law or negotiated boundaries.
Economic Ties and the Belt and Road Initiative
Despite the security tensions, the economic relationship between China and the Philippines is substantial and growing. China is one of the Philippines’ largest trading partners, and Chinese investment in Philippine infrastructure, manufacturing, and technology sectors has expanded over the past decade. This creates an uncomfortable duality: the same government publicly challenging China over maritime disputes is also courting Chinese capital for development projects.
China’s Belt and Road Initiative has been a key vehicle for this economic engagement. Beijing has pursued deeper ties with the Philippines across multiple dimensions, including infrastructure development, trade facilitation, financial coordination, and people-to-people connectivity.
10Asia & the Pacific Policy Studies. The Complex Interdependence of China’s Belt and Road Initiative in the PhilippinesThe results have been mixed. Large infrastructure projects pledged during the Duterte era, including railways, bridges, and flood control systems, have faced delays, financing disagreements, and political controversy. Some projects moved forward; others stalled. The gap between announced investment totals and actual disbursement is a recurring theme in Belt and Road engagement across Southeast Asia, and the Philippines has not been an exception.
The economic dimension creates a real constraint on Philippine foreign policy. The country’s development needs are enormous, and Chinese financing offers a source of capital that comes with fewer governance conditions than Western or multilateral alternatives. Walking away from Chinese investment entirely would carry a cost that no Philippine administration, regardless of its security posture, has been willing to bear. The result is a relationship that is simultaneously adversarial and cooperative depending on which ministry you ask.
Why Philippine Policy Swings So Sharply
One pattern that stands out in China–Philippines relations is how dramatically the Philippine approach shifts with each president. The Philippine system concentrates enormous foreign policy authority in the executive, and successive presidents have used that authority to take the country in strikingly different directions. Aquino III pursued legal confrontation through the arbitral tribunal. Duterte reversed course toward engagement and accommodation. Marcos Jr. has swung back toward balancing and alliance-building.
These swings are not just stylistic. They reflect genuine strategic disagreements about how a mid-sized country with limited military capacity should deal with a much larger and more powerful neighbor. The accommodationist argument holds that the Philippines gains more from friendly relations with China, including investment and development aid, than it loses by quietly shelving territorial claims that it lacks the power to enforce. The balancing argument holds that accommodation only invites further encroachment, and that the Philippines’ real leverage comes from its alliances, its legal victories, and its ability to rally international opinion.
Neither approach has produced a stable resolution. Duterte’s friendlier posture did not stop Chinese activity in contested waters. Marcos’s harder line has not reversed it either. The underlying structural problem remains: China is vastly more powerful than the Philippines in conventional military terms, and no amount of diplomatic creativity changes that basic asymmetry. What changes is how each administration chooses to manage it.
The Chinese Filipino Community and Everyday Relations
Beneath the geopolitical friction, there is a long history of people-to-people connection between China and the Philippines that predates the modern territorial dispute by centuries. Chinese traders were visiting the Philippine archipelago well before Spanish colonization, and today a significant community of Chinese Filipinos, often called Tsinoy, plays a prominent role in Philippine business, education, and public life. By some estimates, ethnic Chinese Filipinos make up only a small percentage of the population but are disproportionately represented in the country’s largest conglomerates and business networks.
The relationship between the Chinese Filipino community and the broader territorial dispute is complicated. Most Chinese Filipinos identify as Filipino first, and the community has deep roots that long predate the People’s Republic of China. But geopolitical friction has periodically generated suspicion toward anything perceived as Chinese influence, and individual Chinese Filipinos sometimes find themselves caught between their cultural heritage and their national loyalty in a way that feels unfair and reductive.
Tourism and labor migration add another layer. Before the pandemic, Chinese tourists were one of the fastest-growing visitor groups in the Philippines, and Filipino workers in China and Hong Kong sent remittances back home. These everyday economic and cultural connections do not disappear when coast guard vessels face off near a contested shoal, but they do get strained. The practical challenge for both governments is managing a relationship where millions of ordinary people are connected by commerce, family ties, and cultural exchange, even as their governments contest sovereignty over reefs and fishing grounds that most of those people will never visit.