On the morning of January 14, 2026, Seaman First Class Rafael Mendoza was standing on the deck of BRP Cabra, a Philippine Coast Guard patrol vessel, watching a China Coast Guard cutter maintain position seven hundred metres to starboard. The Chinese vessel, hull number 5204, had been there for six days. Mendoza had been there for ninety-three. He was not scheduled to rotate off Scarborough Shoal for another twenty-seven days.
Mendoza kept a notebook. In it, he recorded the hull numbers of Chinese vessels that approached within visual range. By mid-January, he had logged thirty-eight distinct vessels since his deployment began in October 2025. Some stayed for hours. Some stayed for weeks. Hull 5204 had become what the crew called a "permanent shadow." It did not approach. It did not communicate. It simply remained, visible on the horizon at all times, a grey shape that never moved closer and never moved away.
Scarborough Shoal, called Bajo de Masinloc in the Philippines and Huangyan Dao in China, is a submerged ring of coral reef approximately 230 kilometres west of Luzon. It has no land above high tide. It has no permanent structures. It has been the site of a slow-motion confrontation since April 2012, when Chinese maritime surveillance vessels prevented the Philippine Navy from arresting Chinese fishermen operating inside the shoal's lagoon. The Philippines withdrew its ships after eight weeks, following what Manila understood to be a U.S.-brokered agreement for mutual withdrawal. China's vessels never left.
The Rotation That Never Ends
Mendoza is part of Coast Guard Station 5, based in Masinloc, Zambales Province. The station was established in 2013, a year after China consolidated control of the shoal. Its primary mission is what the Philippine Coast Guard officially describes as "maritime domain awareness and sovereignty patrols." In practice, this means maintaining a near-continuous presence within the twelve-nautical-mile territorial limit that Manila claims around Scarborough Shoal — a claim China does not recognise.
Rotation cycles are four months. Crews live aboard patrol vessels equipped with desalination units, diesel generators, and supplies that are resupplied by smaller craft every three weeks, weather permitting. During the northeast monsoon season, from November to March, resupply can be delayed by rough seas. Mendoza's crew went thirty-one days between resupply drops in December 2025. They rationed rice and canned mackerel. The generator failed twice. Repairs were conducted at sea.
Lieutenant Commander Eduardo Santos, the commanding officer of BRP Cabra, described the mission in an interview conducted via satellite phone in February 2026. "We do not confront. We do not escalate. We are here because this is Philippine territory, and our presence is the assertion of that fact. The Chinese vessels are here for the same reason. They believe it is theirs. So we stay, and they stay, and nothing happens except that we are both here."
Philippine Coast Guard maritime surveillance reports documented 127 distinct Chinese government and militia vessels operating within twenty nautical miles of Scarborough Shoal between January and December 2025, an average of more than ten per month.
China's strategy in the South China Sea, particularly around contested features like Scarborough Shoal and Second Thomas Shoal, has been characterised by analysts as "grey zone" operations: actions below the threshold of armed conflict that nonetheless achieve strategic objectives through sustained presence, logistical dominance, and incremental assertion of control. The China Coast Guard and the People's Armed Forces Maritime Militia operate in coordinated shifts. Vessels rotate, but the presence does not.
What Happened in 2012
The confrontation at Scarborough Shoal began on April 8, 2012, when the Philippine Navy dispatched BRP Gregorio del Pilar, its largest warship, to inspect Chinese fishing vessels reportedly harvesting protected coral and endangered species inside the shoal's lagoon. A boarding team was launched. Before arrests could be made, two China Marine Surveillance vessels — precursors to the China Coast Guard, which was formally established in 2013 — placed themselves between the Philippine warship and the fishing boats.
The standoff lasted until mid-June 2012. The Philippines replaced its naval vessel with a coast guard cutter, a decision intended to de-escalate by matching the civilian status of Chinese maritime surveillance ships. China continued to reinforce its presence. On June 15, as Typhoon Guchol approached, the Philippine government announced it would withdraw its vessel due to the weather. The U.S. State Department indicated that China had agreed to a mutual withdrawal. The Philippine vessel departed. Chinese vessels did not.
By July 2012, China had established a permanent exclusion perimeter around the shoal. Chinese vessels prevented Filipino fishing boats from entering the lagoon. In 2013, the Philippine government initiated arbitration proceedings under the United Nations Convention on the Law of the Sea (UNCLOS). On July 12, 2016, the Permanent Court of Arbitration in The Hague ruled in favour of the Philippines, determining that Scarborough Shoal could not generate an exclusive economic zone and that China's historic claims to the South China Sea had no basis in international law. China rejected the ruling as "null and void."
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ARBITRATION WITHOUT ENFORCEMENT
The 2016 UNCLOS tribunal ruling in Philippines v. China found that Scarborough Shoal is a rock incapable of sustaining human habitation or economic life, and therefore generates only a twelve-nautical-mile territorial sea, not an exclusive economic zone. The tribunal also found that China had violated Philippine sovereign rights by preventing access to the shoal. China did not participate in the proceedings and has not recognised the ruling.
Source: Permanent Court of Arbitration, Case No. 2013-19, July 2016The Treaty That Doesn't Apply
The Philippines and the United States are treaty allies under the 1951 Mutual Defense Treaty (MDT). The treaty commits both nations to respond to "an armed attack in the Pacific Area on either of the Parties." For years, Philippine and U.S. officials debated whether the MDT applied to incidents in the South China Sea. In March 2019, then-U.S. Secretary of State Mike Pompeo clarified that "any armed attack on Philippine forces, aircraft, or public vessels in the South China Sea will trigger mutual defense obligations under Article IV" of the treaty.
The caveat is the word "armed." Grey zone operations are designed to avoid triggering treaty obligations. Water cannons, not bullets. Ramming, not gunfire. In November 2023, Chinese coast guard vessels used water cannons against Philippine resupply missions to Second Thomas Shoal, injuring several Filipino sailors. The United States condemned the incident but did not invoke the MDT. In August 2024, a Chinese coast guard vessel collided with a Philippine patrol boat near Sabina Shoal, causing structural damage. Again, the MDT was not invoked.
Poling, who has tracked South China Sea incidents since 2014, noted in a March 2026 interview that "China has calibrated its operations to remain below the threshold that would compel a U.S. military response. The result is that the Philippines bears the cost of maintaining its presence while China consolidates de facto control through persistence and logistics."
The Fishermen Who Can't Fish
Masinloc, the coastal town closest to Scarborough Shoal, is home to approximately four thousand registered fishermen. Before 2012, the shoal was one of the most productive fishing grounds in the region. Its lagoon provided shelter during storms and abundant stocks of tuna, lapu-lapu, and squid. Fishermen from Masinloc made the journey in motorised outrigger boats called bancas, departing at dawn and returning by nightfall.
Since 2012, access has been irregular. Chinese coast guard vessels block entry to the lagoon, particularly during peak fishing seasons. In 2024, the Philippine Coast Guard documented forty-three separate incidents in which Filipino fishing boats were turned away from Scarborough Shoal by Chinese vessels. In some cases, fishermen were warned via loudspeaker. In others, coast guard cutters manoeuvred between the bancas and the shoal entrance until the fishermen departed.
Rogelio Bernardo, a fifty-four-year-old fisherman from Barangay Bani in Masinloc, described his last attempt to reach the shoal in an interview in January 2026. "We left at four in the morning. By ten, we could see the shoal. We could also see two large white ships. We tried to go around them, but they followed us. After two hours, we gave up. The fuel we used cost more than what we caught that day."
Bernardo's boat, a ten-metre banca powered by a single diesel engine, cannot make the journey to alternative fishing grounds farther west. Fuel costs make such trips economically unviable. In 2023, Bernardo's household income fell by approximately forty per cent compared to 2011. He has taken work as a labourer in the town port to supplement his income. His eldest son, who had planned to become a fisherman, now works in a call centre in Manila.
ECONOMIC DISPLACEMENT
A 2025 study by the University of the Philippines Marine Science Institute found that fishing communities in Zambales Province reported a 37 per cent decline in average annual income between 2012 and 2024, directly correlated with reduced access to Scarborough Shoal. The study surveyed 412 fishing households across six coastal barangays.
Source: University of the Philippines Marine Science Institute, Fisheries and Coastal Livelihoods Study, March 2025The Permanent Standoff
The confrontation at Scarborough Shoal has no resolution mechanism. Bilateral negotiations between Manila and Beijing have produced no agreement. China has proposed joint development arrangements in the South China Sea, but these proposals require the Philippines to set aside its sovereignty claims and the 2016 arbitration ruling. Philippine presidents have alternated between confrontation and accommodation. Rodrigo Duterte, who served from 2016 to 2022, pursued closer ties with Beijing and downplayed the arbitration ruling. Ferdinand Marcos Jr., who took office in 2022, has strengthened defence cooperation with the United States and authorised more assertive coast guard patrols.
In February 2024, the Philippines and the United States announced new agreements allowing expanded U.S. access to Philippine military bases, including sites facing the South China Sea. In April 2024, the two countries conducted their largest-ever joint military exercises, involving more than 16,000 troops and live-fire drills near the disputed waters. China responded by increasing the frequency and size of its maritime patrols. The Asia Maritime Transparency Initiative recorded a 34 per cent increase in Chinese coast guard activity near Philippine-occupied features in the first six months of 2024 compared to the same period in 2023.
The standoff has become institutionalised. The Philippine Coast Guard has incorporated Scarborough Shoal rotations into its standard operational cycle. The China Coast Guard has built dedicated support infrastructure in Hainan Province to sustain indefinite deployments. The vessels remain. The sailors rotate. The shoal itself remains contested, unclaimed in practice by either side because both sides are always there.
The Notebook
Rafael Mendoza completed his rotation on February 10, 2026. He handed his notebook to the seaman who replaced him. The new sailor added his own entries. Hull 5204 remained on station. It was still there when Mendoza returned to Masinloc, and it was still there two weeks later when the next resupply mission departed.
In March 2026, the Philippine Department of Foreign Affairs submitted a new diplomatic protest to China's embassy in Manila — the 178th such protest since 2012. The note stated that China's presence at Scarborough Shoal constituted a violation of Philippine sovereignty and the 2016 arbitration ruling. China's foreign ministry responded with a statement reiterating that "Huangyan Dao is China's inherent territory" and that "China's coast guard vessels are conducting normal law enforcement activities in waters under Chinese jurisdiction."
Mendoza is scheduled to return to Scarborough Shoal in June 2026. He will bring a new notebook. He will resume logging hull numbers. The Chinese vessels will remain visible on the horizon. Neither side will fire. Neither side will leave. The standoff will continue, indefinite and unresolved, until one side decides the cost of staying is greater than the cost of abandoning a claim to a submerged reef that has become the measure of who controls the sea.