By Cliff Potts, CSO, and Editor-in-Chief of WPS News
Baybay City, Leyte, Philippines — October 9, 2026
Reporting Period: September 1, 2026, 00:01 through September 30, 2026, 23:59, Philippine Standard Time (UTC+8).
Overview
Throughout September 2026, the West Philippine Sea remained under sustained pressure from Chinese maritime and military operations. The reporting period reflected the continued normalization of gray-zone activity rather than a distinct new escalation.
China maintained coast guard, naval, and maritime militia activity around major Philippine maritime features, including Bajo de Masinloc (Scarborough Shoal), Ayungin Shoal (Second Thomas Shoal), Escoda Shoal (Sabina Shoal), and Pag-asa Island.
The Armed Forces of the Philippines (AFP) subsequently reported monitoring 101 Chinese coast guard and naval vessels across these four areas during September, compared with 56 in August. These were monitoring totals, not evidence that 101 vessels were present simultaneously (Daily Tribune, 2026).
Significant developments included Chinese flare discharges toward a Philippine Coast Guard aircraft on September 7, continued foreign research-vessel activity near Bajo de Masinloc, Chinese interference with a Philippine resupply mission on September 24, and the monitoring of Chinese vessels near Occidental Mindoro on September 27.
Philippine agencies continued patrols, maritime monitoring, and support for Filipino fishing communities. Diplomatic protests and international statements reinforced Manila’s position that its maritime operations are lawful under international law.
Diplomatic Developments
The Philippines maintained its position that maritime rights in the West Philippine Sea are governed by the United Nations Convention on the Law of the Sea (UNCLOS) and the July 12, 2016, South China Sea Arbitral Award.
The Philippine government continued rejecting China’s expansive maritime claims and defended Philippine activities around features within the country’s exclusive economic zone.
On September 25, the National Task Force for the West Philippine Sea condemned Chinese interference with the September 24 rotation and resupply mission to BRP Sierra Madre at Ayungin Shoal. The task force described the mission as lawful and called on Chinese coast guard and naval forces to stop obstructing Philippine operations (NTF-WPS, 2026).
China continued asserting its own territorial and maritime claims, which conflict with the Philippine position and the findings of the 2016 arbitral tribunal.
International responses included a September 27 statement by United States Ambassador Lee Lipton condemning Chinese maneuvers during the Ayungin resupply operation. The ambassador reaffirmed American support for the Philippines and called for an end to tactics threatening freedom of navigation (Philippine News Agency, 2026a).
The diplomatic disagreement remained unresolved at the close of September.
Maritime Activity (Surface)
Chinese maritime activity remained concentrated around the principal areas monitored by the AFP.
The AFP’s September monitoring figures, released on October 6, provided the following breakdown:
| Monitored area | China Coast Guard | PLA Navy | Total |
|---|---|---|---|
| Ayungin Shoal | 14 | 9 | 23 |
| Bajo de Masinloc | 25 | 14 | 39 |
| Escoda Shoal | 7 | 4 | 11 |
| Pag-asa Island area | 23 | 5 | 28 |
| Total | 69 | 32 | 101 |
Source: AFP figures reported by Daily Tribune (2026). These totals reflect vessels monitored during September, not a simultaneous vessel count.
For September 15–21, the AFP reported 35 Chinese naval and coast guard vessels across the four monitored areas, down from 48 during September 8–14. The AFP stated that Philippine naval and air patrols would continue under established rules and procedures (Philippine News Agency, 2026b).
A separate concern involved the Chinese research vessel Haiyang Dizhi Shihao. On September 4, the Philippine Coast Guard reported that the vessel had operated within the Philippine exclusive economic zone for 25 days, including approximately three weeks within 12 nautical miles of Bajo de Masinloc. The PCG said Canada’s Dark Vessel Detection program helped track the ship despite its reported deactivation of its Automatic Identification System. Philippine authorities reported that the vessel had no authorization to conduct marine scientific research (The Philippine Star, 2026).
On September 27, the PCG deployed an aircraft and BRP Teresa Magbanua to monitor and challenge China Coast Guard vessel CCG-3303 near Cabra Island, Occidental Mindoro. The aircraft located the vessel approximately 36.61 nautical miles northwest of the island. The Chinese vessel did not respond to repeated Philippine radio challenges (Philippine Coast Guard, 2026a).
These activities showed that Chinese maritime operations were not limited to the immediate waters surrounding the most frequently contested reefs and shoals.
Air Activity
On September 7, an unarmed Philippine Coast Guard aircraft conducting a maritime domain awareness flight over the Kalayaan Island Group encountered Chinese military challenges.
According to the PCG, Chinese forces stationed at Zamora Reef (Subi Reef) and Panganiban Reef (Mischief Reef) issued radio warnings and discharged multiple flares toward the Philippine aircraft.
The Philippine aircrew responded that it was conducting a lawful and routine flight. The crew also observed numerous Chinese maritime militia vessels sheltered inside the lagoons of the two reefs (Philippine Coast Guard, 2026b).
On September 17, a PCG Piper Navajo aircraft conducting surveillance near Bajo de Masinloc received a radio challenge from a Chinese naval warship. The Philippine crew replied that it was operating lawfully within Philippine maritime zones (GMA News Online, 2026a).
On September 27, PCG aircraft 2081 conducted an aerial patrol near Cabra Island, locating and challenging China Coast Guard vessel CCG-3303.
These incidents demonstrated continued Chinese efforts to challenge Philippine aircraft conducting surveillance and monitoring missions. No verified aircraft collision or shootdown was identified in the reviewed reporting.
Fisherfolk and Civilian Activity
Filipino fishing communities continued operating in waters affected by the presence of Chinese coast guard and maritime militia vessels.
On September 17, the Bureau of Fisheries and Aquatic Resources (BFAR), supported by the Philippine Coast Guard, conducted a fuel and food assistance mission near Bajo de Masinloc.
The PCG reported observing 35 Filipino fishing boats positioned to receive assistance. Chinese vessels present in the area included one PLA Navy warship, three China Coast Guard vessels, and three maritime militia vessels (GMA News Online, 2026a).
On September 18, BFAR vessel BRP Datu Magat Salamat was involved in a collision with a Chinese coast guard vessel while conducting a maritime patrol and fuel assistance mission approximately 54 nautical miles from Palawan.
The Department of Foreign Affairs condemned the incident, stating that the Philippine vessel was engaged in lawful humanitarian activities supporting Filipino fisherfolk (Philippine News Agency, 2026c).
The continued need for government-supported fuel deliveries, food assistance, and maritime security patrols showed the practical difficulties facing Filipino fishing communities in contested waters.
These conditions affected fishing access and the safety of civilian operations. The available evidence does not establish a complete monthly count of fishing trips disrupted or income lost.
Security Incidents
Several documented incidents during September involved direct interference with Philippine maritime or aerial operations.
September 7 — Flares directed toward Philippine aircraft
Chinese military forces discharged flares toward an unarmed PCG aircraft near Zamora and Panganiban Reefs. The PCG recorded the incident during a routine maritime domain awareness flight.
September 18 — Collision involving BFAR vessel
According to the PCG, China Coast Guard vessel CCG-21585 approached BRP Datu Magat Salamat during a fisheries assistance mission.
At approximately 11:04 a.m., the Chinese vessel crossed near the Philippine ship’s stern at a reported distance of about 10 meters. At approximately 11:13 a.m., the Chinese vessel repeated the maneuver and made contact with the BFAR ship.
The Philippine government reported visible damage to the vessel and condemned the Chinese actions (GMA News Online, 2026b; Philippine News Agency, 2026c).
September 24 — Interference with Ayungin resupply mission
A Philippine rotation and resupply mission involving M/V Lapu-Lapu and Philippine naval and coast guard support vessels encountered Chinese maritime forces while approaching Ayungin Shoal.
According to Philippine military reporting, the interference occurred between approximately 8:35 p.m. and 11:00 p.m., about 60 nautical miles from the shoal.
Chinese vessels monitored, shadowed, and approached the Philippine mission. A PLA Navy warship issued radio warnings threatening compulsory measures.
The Philippine mission was discontinued at approximately 11:08 p.m. because of safety concerns.
No collision or injuries were reported during this incident. Reuters independently reported the Philippine Coast Guard’s account of the aborted mission (Reuters, 2026; The Philippine Star, 2026b).
September 27 — Chinese coast guard vessel near Cabra Island
The PCG monitored CCG-3303 within the Philippine exclusive economic zone northwest of Cabra Island. Philippine aircraft issued repeated radio challenges without receiving a response.
The reviewed reports did not establish a collision or use of force during this encounter.
Taken together, these incidents reflected different forms of interference: aerial warnings, physical contact between vessels, close maritime approaches, and obstruction of supply operations.
Weather and Sea Conditions
Weather remained an important operating factor in the West Philippine Sea throughout September.
On September 4, PAGASA Administrator Nathaniel Servando stated that the southwest monsoon, locally known as habagat, was expected to continue affecting western Luzon, Occidental Mindoro, and portions of the Visayas through September.
PAGASA initially expected two to three tropical cyclones during the month, although rainfall was forecast to be less intense than during portions of August (Philippine News Agency, 2026d).
PAGASA’s subsequent September climate review identified several weather systems affecting the Philippines, including the southwest monsoon, easterlies, low-pressure areas, and tropical cyclones.
Tropical Storm Pilandok (Krovanh), active from August 30 through September 3, enhanced southwest monsoon rainfall over western sections of northern and central Luzon.
Tropical Cyclone Queenie passed through the Philippine Area of Responsibility from September 24 through September 27 but did not directly affect the country during its passage (PAGASA, 2026).
Rainfall was generally below to near normal across much of the country, with above-normal rainfall in several western Luzon provinces, including Zambales and Bataan.
Adverse weather can reduce visibility, complicate smaller-vessel operations, and restrict patrol schedules. However, the available weather records do not establish that particular Chinese maritime activities were caused by or coordinated with these weather conditions.
Seismic and Geophysical Activity
PHIVOLCS recorded earthquake activity in several Philippine regions during September, including offshore areas near Mindanao and portions of the central Philippines.
The reviewed PHIVOLCS records did not identify a seismic event that could be directly connected to the reported West Philippine Sea maritime incidents.
No verified earthquake-related disruption to Philippine maritime patrols, fisheries assistance operations, or the September 24 Ayungin resupply mission was established.
Accordingly, seismic activity was not a material factor in this month’s West Philippine Sea security assessment (PHIVOLCS, 2026).
Assessment
September 2026 demonstrated the continuing nature of Chinese gray-zone operations in the West Philippine Sea.
The evidence supports five principal findings.
First, Chinese coast guard and naval vessels maintained a sustained presence around important Philippine maritime features. The AFP’s monthly monitoring figures showed a higher number of Chinese vessels than in August, although these figures alone do not establish a permanent increase in force levels.
Second, Chinese interference affected several types of Philippine activity, including aerial surveillance, fisheries assistance, and military resupply operations.
Third, the September 18 collision and September 24 aborted resupply mission showed that close approaches and obstruction could produce direct operational consequences without developing into open armed conflict.
Fourth, Philippine authorities continued conducting patrols, supporting fishing communities, documenting incidents, and asserting maritime rights through diplomatic channels.
Fifth, international diplomatic support remained visible, particularly through the United States’ response to the Ayungin incident. Such statements did not, however, resolve the underlying maritime disputes.
The month’s developments were consistent with the established pattern of sustained pressure, repeated challenges to Philippine operations, and the gradual normalization of Chinese coast guard, naval, and militia activity in contested waters.
The central finding is continuity, not a new escalation. Philippine maritime rights remained under pressure, and routine civilian and government operations continued to face interference.
The September record illustrates how repeated incidents can become part of the operating environment even when no single event results in a broader military confrontation.
References
Daily Tribune. (2026, October 6). AFP: 101 Chinese vessels monitored in WPS in September. https://tribune.net.ph/amp/story/2026/10/06/afp-101-chinese-vessels-monitored-in-wps-in-september
GMA News Online. (2026a, September 18). PCG: Chinese vessels seen in Bajo de Masinloc as PH distributes ayuda to fishers. https://www.gmanetwork.com/news/topstories/nation/1002816/pcg-chinese-vessels-seen-in-bajo-de-masinloc-as-ph-distributes-ayuda-to-fishers/story/
GMA News Online. (2026b, September 18). Chinese vessel rams PH ship on fuel subsidy mission near Palawan. https://www.gmanetwork.com/news/topstories/nation/1002818/chinese-vessel-rams-ph-ship-on-fuel-subsidy-mission-near-palawan/story/
National Task Force for the West Philippine Sea. (2026, September 25). Statement of the National Task Force for the West Philippine Sea. Philippine Information Agency. https://pia.gov.ph/press-release/statement-of-the-national-task-force-for-the-west-philippine-sea-4/
Philippine Atmospheric, Geophysical and Astronomical Services Administration. (2026). Monthly Philippine agro-climatic review and outlook: September 2026. https://origin.pagasa.dost.gov.ph/agri-weather/monthly-agroclimatic-review-and-outlook
Philippine Coast Guard. (2026a, September 28). PCG deploys aircraft and BRP Teresa Magbanua to challenge China Coast Guard vessel near Cabra Island; PLA Navy warships monitored in the area. Philippine Information Agency. https://pia.gov.ph/news/pcg-deploys-aircraft-and-brp-teresa-magbanua-to-challenge-china-coast-guard-vessel-near-cabra-island-pla-navy-warships-monitored-in-the-area/
Philippine Coast Guard. (2026b, September 10). PLA fires flares at unarmed PCG aircraft during maritime domain awareness flight over Kalayaan Island Group. Philippine Information Agency. https://pia.gov.ph/news/pla-fires-flares-at-unarmed-pcg-aircraft-during-maritime-domain-awareness-flight-over-kalayaan-island-group/
Philippine Institute of Volcanology and Seismology. (2026). Seismological observation and earthquake prediction division: September 2026 earthquake records. https://earthquake.phivolcs.dost.gov.ph/
Philippine News Agency. (2026a, September 27). US hits China interference of PH resupply mission at Ayungin Shoal. https://www.pna.gov.ph/articles/1284927
Philippine News Agency. (2026b, September 22). 35 Chinese ships seen in 4 key WPS features from mid-September. https://www.pna.gov.ph/articles/1284596
Philippine News Agency. (2026c, September 18). DFA: No justification for China Coast Guard to ram, damage BFAR vessel. https://www.pna.gov.ph/articles/1284397
Philippine News Agency. (2026d, September 4). PAGASA: ‘Habagat’ likely to last end of Sept, less rain expected. https://www.pna.gov.ph/articles/1283385
Reuters. (2026, September 25). Philippines accuses China of obstructing resupply mission in South China Sea. https://www.reuters.com/world/china/philippines-accuses-china-obstructing-resupply-mission-south-china-sea-2026-09-25/
The Philippine Star. (2026a, September 5). PCG: Chinese ship monitored in Panatag for weeks. https://www.philstar.com/headlines/2026/09/05/2554092/pcg-chinese-ship-monitored-panatag-weeks
The Philippine Star. (2026b, September 26). China blocks Ayungin resupply mission anew. https://www.philstar.com/headlines/2026/09/26/2558942/china-blocks-ayungin-resupply-mission-anew/amp/
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