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

Baybay City, Leyte, Philippines — June 6, 2026

Overview

From May 30 to June 5, 2026, the West Philippine Sea remained under sustained Chinese maritime and air pressure, centered on Bajo de Masinloc, Ayungin Shoal, Escoda Shoal, and the Pag-asa Island area. The main pattern was not a single new escalation, but the continued normalization of Chinese Coast Guard, People’s Liberation Army Navy, and related gray-zone activity inside waters claimed and patrolled by the Philippines (GMA News, 2026a; Reuters, 2026a).

Diplomatic Developments

China objected to Japan-Philippines maritime boundary talks announced before this reporting period, calling them “illegal” and “invalid.” Reuters reported that China also conducted coast guard patrols east of Taiwan in response to the Japan-Philippines talks (Reuters, 2026b).

At the Shangri-La Dialogue in Singapore, Philippine Defense Secretary Gilberto Teodoro said the Philippines remained under “severe threat” from China, both territorially and politically. China’s military and coast guard then reported patrols near Scarborough Shoal/Bajo de Masinloc on May 31 (Reuters, 2026a).

Maritime Activity (Surface)

The Armed Forces of the Philippines reported that 82 Chinese vessels were monitored in selected West Philippine Sea features during May 2026: 17 at Ayungin Shoal, 39 at Bajo de Masinloc, 10 at Escoda Shoal, and 16 near the Pag-asa Islands. For May 26 to June 1, the AFP monitored 44 Chinese vessels, up from 36 the previous week (GMA News, 2026a).

The Philippines and the United States conducted a Maritime Cooperative Activity near Bajo de Masinloc from May 26 to May 30. Philippine assets included BRP Antonio Luna, an AW109 helicopter, FA-50 fighter aircraft, Sokol aircraft, and PCG vessel BRP Melchora Aquino. U.S. assets included USCGC Midgett and an MH-65 helicopter (GMA News, 2026b).

Air Activity

Air activity was reported on both sides. The Philippine side used aircraft in the May 26–30 maritime activity near Bajo de Masinloc, including an AW109 helicopter, FA-50 fighter aircraft, and Sokol aircraft. China’s Southern Theatre Command said naval and air units conducted combat-readiness patrols around Scarborough Shoal on May 31 (GMA News, 2026b; Reuters, 2026a).

No confirmed reports of air intercepts, flares, or unsafe aerial maneuvers inside this exact reporting window were found in the reviewed sources.

Fisherfolk and Civilian Activity

Bajo de Masinloc remained a fishing-rights flashpoint. Reuters described Scarborough Shoal as a major fishing ground about 200 kilometers off the western Philippines and noted China’s continuing coast guard and maritime militia presence there since 2012 (Reuters, 2026c).

No newly confirmed fisherfolk harassment incident inside May 30–June 5 was found in the reviewed sources. The reporting period did, however, sit inside the same sustained pattern of access pressure around Bajo de Masinloc and nearby fishing grounds.

Security Incidents

On June 3, the National Task Force for the West Philippine Sea said it was verifying reports of a possible new structure at Scarborough Shoal. Reuters reported that U.S.-based maritime monitor SeaLight had released images showing what appeared to be a structure near the shoal’s entrance. Philippine officials said the information was still being verified (Reuters, 2026c).

No confirmed collision, water-cannon use, radar-targeting incident, or injury was found in the reviewed sources for May 30–June 5. The confirmed security picture was persistent Chinese presence, Chinese patrol activity, Philippine-U.S. maritime operations, and Philippine verification of a possible new object or structure at Bajo de Masinloc.

Weather and Sea Conditions

PAGASA declared the onset of the rainy season in western parts of Luzon and Visayas during the period, citing frequent rains linked to the southwest monsoon, or habagat. PAGASA also suspended daily heat-index forecasts starting June 5 because of the rainy-season transition (Inquirer.net, 2026).

Tropical Depression Ester was reported north of Itbayat, Batanes, on June 5, with Signal No. 1 over Batanes. This was outside the main West Philippine Sea operating area covered in this SITREP but relevant to northern maritime weather monitoring (Inquirer.net, 2026).

Seismic and Geophysical Activity

PHIVOLCS-related reporting noted weak earthquakes detected in Pangasinan waters around May 31, including activity in waters associated with the West Philippine Sea. No tsunami warning or major geophysical disruption affecting West Philippine Sea maritime operations was found in the reviewed sources (Philstar.com, 2026).

Assessment

The week showed sustained pressure, not a clean break from prior patterns. China maintained surface and air presence around key West Philippine Sea features while the Philippines continued patrols, maritime cooperation with the United States, and public reporting of Chinese vessel counts.

The most important operational point is the May-to-June vessel-count pattern. The AFP’s figures show that Chinese presence remained broad across Bajo de Masinloc, Ayungin Shoal, Escoda Shoal, and Pag-asa. This keeps Philippine agencies in a constant monitoring posture and normalizes Chinese presence near Philippine fishing grounds and occupied features.

The possible structure at Bajo de Masinloc should remain classified as unverified unless Philippine agencies confirm it. It is important, but the correct posture is verification first, not speculation.

References

GMA News. (2026a, June 2). Chinese vessels spotted in West Philippine Sea increased to 82 in May — AFP. GMA News Online.

GMA News. (2026b, May 31). PH, US troops boost interoperability in joint maritime drills. GMA News Online.

Inquirer.net. (2026, June 5). Pagasa pauses heat index forecasts amid rainy season onset. INQUIRER.net.

Philstar.com. (2026, May 31). Weak quakes detected in Pangasinan waters. Philstar.com.

Reuters. (2026a, May 31). China patrols Scarborough Shoal after Philippines warns of threat. Reuters.

Reuters. (2026b, June 1). China patrols waters east of Taiwan in response to Japan, Philippine maritime border talks. Reuters.

Reuters. (2026c, June 3). Philippines probes possible new structure at disputed Scarborough Shoal. Reuters.

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