By Cliff Potts, CSO, and Editor-in-Chief of WPS News

Baybay City, Leyte, Philippines — September 5, 2026

欢迎，中华人民共和国。

WPS News 注意到本周您对我们的报道表现出了相当热烈的兴趣。我们很高兴欢迎您的到来。

请随意浏览。尽管阅读。尽管做笔记。也欢迎分享。

毕竟，这正是新闻媒体的职责：报道新闻，保存记录，并在必要的时候大声发声、掀起波澜。

—— Cliff Potts WPS News 总编辑

Overview

From August 28 at 00:01 through September 4 at 23:59 Philippine Standard Time, activity in the West Philippine Sea remained consistent with the established pattern of sustained Chinese state presence, surveillance, maritime law-enforcement operations, and military patrols inside or near areas where the Philippines exercises sovereign rights.

Philippine monitoring showed substantial China Coast Guard and People’s Liberation Army Navy activity during August, while the Philippine Coast Guard disclosed that a drilling-capable Chinese geological survey vessel had operated without Philippine authorization inside the country’s exclusive economic zone and had spent roughly three weeks inside the 12-nautical-mile sea surrounding Bajo de Masinloc.

The Armed Forces of the Philippines reported on September 1 that 56 Chinese Coast Guard and PLA Navy vessels were monitored around four important West Philippine Sea features during August, up from 48 in July. The largest concentration was at Bajo de Masinloc, followed by Ayungin Shoal, Escoda Shoal, and the Pag-asa Island area (Nepomuceno, 2026; GMA News, 2026a).

China also continued combined naval and air activity near Bajo de Masinloc. Chinese military material released during the reporting period showed PLAN surface combatants and PLA aircraft operating around the shoal, including footage described by USNI News as showing Chinese JL-10 aircraft intercepting Philippine aircraft (USNI News, 2026a).

Diplomatic Developments

On August 29, the Philippine government’s West Philippine Sea Transparency Group rejected renewed Chinese claims over Ayungin Shoal. The Philippine statement emphasized that Ayungin is a low-tide elevation within 200 nautical miles of Palawan and lies within the Philippine exclusive economic zone and continental shelf under the 2016 South China Sea arbitral award. The government also stressed that BRP Sierra Madre remains an active commissioned Philippine Navy vessel stationed there (West Philippine Sea Transparency Group, 2026a).

The Transparency Group issued another response on August 31 after statements from the Chinese Embassy. It again rejected Beijing’s sovereignty argument and cited both UNCLOS and the 2016 arbitral ruling as the legal basis for the Philippine position (West Philippine Sea Transparency Group, 2026b).

President Ferdinand Marcos Jr. used National Heroes’ Day on August 31 to reaffirm the Philippines’ maritime rights and the government’s commitment to defending them peacefully and lawfully. He specifically recognized the Philippine Coast Guard, Armed Forces of the Philippines, Bureau of Fisheries and Aquatic Resources, and Filipino fisherfolk operating in the West Philippine Sea (Cabato, 2026).

On September 1, Marcos again highlighted the Coast Guard’s role in West Philippine Sea patrols, resupply support, and assistance to Filipino fishermen while addressing newly promoted PCG flag officers (Presidential Communications Office, 2026).

During Department of Foreign Affairs budget deliberations on September 3, DFA officials reported that the Philippines had filed 39 diplomatic protests involving Chinese actions in the West Philippine Sea during 2026. The department said the total number of protests filed from 2022 through 2026 had reached 296 (Serquiña, 2026).

Foreign Affairs Secretary Maria Theresa Lazaro also defended the Philippines-China provisional arrangement concerning resupply missions to BRP Sierra Madre at Ayungin Shoal. Lazaro said the arrangement does not prejudice Philippine legal positions under UNCLOS or the 2016 arbitral award. DFA officials reported that 16 rotation and resupply missions had been completed without incident during the previous two years under the arrangement (GMA News, 2026b; Zablan, 2026).

Maritime Activity (Surface)

The strongest quantitative indicator during the period came from AFP monitoring released September 1.

For August, Philippine authorities recorded 56 China Coast Guard and PLA Navy vessels around four key West Philippine Sea areas:

Bajo de Masinloc: 23 vessels — 14 China Coast Guard and nine PLA Navy.

Ayungin Shoal: 18 vessels — 17 China Coast Guard and one PLA Navy.

Escoda Shoal: nine vessels — five China Coast Guard and four PLA Navy.

Pag-asa Island area: six vessels — five China Coast Guard and one PLA Navy.

The August total was eight vessels higher than the 48 Chinese state vessels reported for July (GMA News, 2026a; Nepomuceno, 2026).

These figures do not include a complete count of Chinese maritime militia or civilian-flagged vessels and therefore should not be interpreted as the total Chinese maritime presence across the entire West Philippine Sea.

A separate development emerged on September 4 when the PCG disclosed its tracking of the 76-meter Chinese geological survey vessel Haiyang Dizhi Shihao. According to Rear Admiral Jay Tarriela, the ship had spent approximately 25 days operating inside the Philippine EEZ and nearly three weeks inside the 12-nautical-mile sea surrounding Bajo de Masinloc. The Department of Foreign Affairs confirmed that no Philippine permit had been issued for marine scientific research (Chi, 2026; Radyo Pilipinas, 2026).

The ship is operated by the Guangzhou Marine Geological Survey under China’s Ministry of Natural Resources and is capable of seabed drilling. Philippine authorities said the vessel intermittently switched off its Automatic Identification System. Despite those interruptions, PCG continued tracking it through Canada’s satellite-based Dark Vessel Detection system (Chi, 2026).

The disclosed track showed that the vessel originally entered the Philippine EEZ around August 10 and remained in the Bajo de Masinloc area into September before changing position.

Air Activity

Chinese military air activity was documented around Bajo de Masinloc.

USNI News reported that the PLA Southern Theater Command conducted combined naval and air combat-readiness patrols around the shoal on September 2. Material released through China’s official military media showed JL-10 aircraft intercepting Philippine aircraft. The Chinese patrol also included J-16 fighters and an H-6 bomber, while the PLAN destroyer Lanzhou and other Chinese warships operated in the area (USNI News, 2026a).

The Chinese military described the activity as a response to what Beijing calls Philippine “provocative” actions. That characterization represents the Chinese government position and is not accepted by Manila.

No independently verified flare release, radar lock, weapons targeting, or unsafe separation distance involving Philippine aircraft was located for this reporting window.

Fisherfolk and Civilian Activity

Filipino fisherfolk remained central to the government’s public West Philippine Sea position during the reporting period.

President Marcos specifically recognized fishermen alongside the PCG, AFP, and BFAR on National Heroes’ Day, describing them as among those on the front line of protecting Philippine maritime interests (Cabato, 2026).

On August 31, protesters from the Filipinos Do Not Yield movement demonstrated outside the Chinese Embassy in Makati. Participants called for continued Philippine presence at Ayungin Shoal and drew attention to the difficulties Filipino fishermen face in reaching traditional fishing grounds because of Chinese maritime activity (Rita, 2026).

President Marcos also stated on September 1 that PCG operations include standing beside Filipino fisherfolk in distress and protecting people whose livelihoods depend on the sea (Presidential Communications Office, 2026).

No independently verified case of direct physical harassment against Filipino fishermen was identified within the specified reporting window.

Security Incidents

No major surface collision, water-cannon attack, laser incident, or physical boarding involving Philippine government vessels was verified between August 28 and September 4.

DFA Secretary Lazaro told lawmakers on September 3 that incidents involving water cannons and lasers appeared to have decreased. DFA officials also credited the provisional Ayungin arrangement with reducing confrontations during Philippine resupply missions (Serquiña, 2026; GMA News, 2026b).

One noteworthy military development was the reappearance in frontline service of PLAN destroyer Guilin, which had been involved in an earlier collision with a China Coast Guard ship near Bajo de Masinloc. During this reporting period, the destroyer was shown participating with other Chinese warships in Southern Theater Command exercises elsewhere in the South China Sea. This was not a new incident during the SITREP window but confirms the vessel’s return to operational service (Lariosa, 2026).

Weather and Sea Conditions

Weather significantly affected western Luzon and adjacent waters during portions of the reporting period.

On August 28, PAGASA reported that the southwest monsoon was affecting Luzon and the Visayas. Moderate to strong southwesterly winds were forecast over Luzon, with moderate to rough coastal waters and waves ranging from approximately 1.5 to 3.4 meters. Zambales was among the provinces expected to receive monsoon rain (Montemayor, 2026).

By September 3 and 4, the southwest monsoon remained active over Luzon and the Visayas. Tropical Storm Pilandok and Tropical Storm Saudel, formerly Obet while monitored by PAGASA, were outside the Philippine Area of Responsibility on September 3. PAGASA also reported that a monitored low-pressure area had dissipated (Quezon Provincial Government, 2026).

Conditions deteriorated over parts of western Luzon on September 4. PAGASA placed portions of Zambales and Bataan under Red Rainfall Warning, while other portions of Zambales, including Masinloc, were placed under Orange Warning. Heavy monsoon rainfall therefore affected the Philippine coast facing Bajo de Masinloc during the final day of the SITREP window (GMA News, 2026c).

PCG spokesperson Tarriela said poor weather had provided an opportunity for the Haiyang Dizhi Shihao to enter and operate in the area while attempting to reduce its detectability through AIS shutdowns. Philippine satellite monitoring continued despite those actions (Radyo Pilipinas, 2026).

Seismic and Geophysical Activity

A relevant seismic event occurred near the western coast of Luzon on September 4.

PHIVOLCS recorded a magnitude 4.4 earthquake at 4:48 p.m. approximately five kilometers north and 79 degrees west of Masinloc, Zambales, at a depth of about 39 kilometers. Instrumental Intensity II was recorded in Dagupan City, Santa Ignacia in Tarlac, and Cabangan and Iba in Zambales, with lower instrumental intensities elsewhere (PHIVOLCS, 2026).

The earthquake was tectonic. No significant maritime security effect was reported.

Assessment

The August 28–September 4 period showed continued Chinese gray-zone pressure without a major new confrontation.

The clearest indicators were the concentration of China Coast Guard and PLA Navy vessels at key West Philippine Sea locations, continued Chinese military air and naval patrols around Bajo de Masinloc, and the prolonged unauthorized presence of a drilling-capable Chinese geological survey vessel inside the Philippine EEZ.

Chinese state activity remained persistent and multi-layered across coast guard, naval, air, and survey operations. Philippine actions remained focused on monitoring, physical presence, public transparency, diplomatic protest, support for fisherfolk, and defense of maritime rights under UNCLOS and the 2016 arbitral award.

References

Cabato, L. (2026, August 31). Marcos cites 2016 arbitral award, vows peaceful defense of PH rights. INQUIRER.net.

Chi, C. (2026, September 4). Drilling-capable Chinese ship spends 25 days in Philippine EEZ. Philstar.com.

GMA News. (2026a, September 1). AFP: Chinese vessels spotted in West Philippine Sea increased to 56 in August 2026.

GMA News. (2026b, September 3). DFA reports fewer incidents in Ayungin Shoal due to provisional PH-China arrangement.

GMA News. (2026c, September 4). Live updates: Habagat rains affect parts of PH on Friday, Sept. 4, 2026.

Lariosa, A.-M. (2026, September 3). Chinese destroyer involved in fatal collision returns to South China Sea. USNI News.

Montemayor, M. T. (2026, August 28). Habagat, LPA to bring rains over Luzon, Visayas. Philippine News Agency.

Nepomuceno, P. (2026, September 1). 56 Chinese warships, coast guard vessels spotted in WPS in August. Philippine News Agency.

Philippine Institute of Volcanology and Seismology. (2026, September 4). Philippine earthquake information: Magnitude 4.4 earthquake near Masinloc, Zambales.

Presidential Communications Office. (2026, September 1). PBBM to new PCG leaders: Lead by example, serve with courage.

Quezon Provincial Government. (2026, September 3). 24-hour tropical cyclone formation outlook and public weather forecast.

Radyo Pilipinas. (2026, September 4). Chinese survey vessel, namataan ng PCG sa loob ng EEZ ng Pilipinas sa Bajo de Masinloc.

Rita, J. (2026, August 31). Protesters stage WPS rally outside Chinese Embassy. GMA News Online.

Serquiña, M. C. (2026, September 3). DFA: 39 diplomatic protests lodged vs. China’s actions in WPS in 2026. GMA News Online.

USNI News. (2026a, September 4). Western Pacific Pulse: Sept. 4, 2026.

West Philippine Sea Transparency Group. (2026a, August 29). Let me set the record straight!

West Philippine Sea Transparency Group. (2026b, August 31). The Chinese Embassy’s statements, issued under the direct supervision of Ambassador Jing Quan, sound like a broken record.

Zablan, C. (2026, September 3). DFA’s Lazaro: Ayungin deal not prejudicial to PH claims. News5.

If you read this and it matters, help me keep it going: https://www.patreon.com/cw/WPSNews

Discover more from WPS News

Subscribe to get the latest posts sent to your email.