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South China Sea: Chinese patrol activity at Scarborough Shoal

Time window: Last 7 days · Audience: General analyst · Type: Situation report · DTG: 2026-11-05 10:06Z · Overall confidence: HIGH

BLUF

China’s 30 October patrol announcements at Scarborough Shoal, alongside reported China Coast Guard training near Second Thomas and Sabina Shoals, add to an ongoing pattern of maritime presence signalling. There is a roughly even chance of an unsafe encounter during a Philippine resupply run to Second Thomas Shoal in the next 30 days, but the reporting does not establish preparations for a deliberate attack.

Executive summary

On 30 October, the China Coast Guard announced law-enforcement patrols at Scarborough Shoal, while the PLA Southern Theater Command announced combat-readiness patrols by naval and air forces. A Philippine Coast Guard flight on 29 October reportedly tracked three China Coast Guard ships, five Chinese maritime militia vessels and a Chinese navy warship near the shoal. CCTV and Tencent News also reported China Coast Guard training near Second Thomas and Sabina Shoals. The reported exercise subjects are disputed: official announcements did not specify them, while a blog account described interception, boarding and water cannon drills. The Philippine Coast Guard is also investigating a Chinese vessel with sensor-equipped equipment inside Scarborough Shoal’s lagoon. China described its patrols as countermeasures against Philippine actions. Competing claims about which side is conducting incursions remain unresolved.

Change from previous assessment

Since the 4 November brief, reporting adds China Coast Guard and PLA Southern Theater Command patrol announcements at Scarborough Shoal, a Philippine Coast Guard account of Chinese vessels tracked there, and an investigation into a sensor-equipped object inside the lagoon. The reported occurrence of training near Second Thomas and Sabina Shoals is now supported by CCTV and Tencent News reporting, raising confidence in the training itself. Confidence in the specific reported drill subjects remains low because official announcements did not disclose them and the detailed account is uncorroborated.

Key judgments

1. The China Coast Guard and PLA Southern Theater Command almost certainly announced patrols at Scarborough Shoal on 30 October. Their public statements described the actions as countermeasures against Philippine infringement and provocation, which is Beijing’s position rather than independently established attribution. (Confidence: high · REPORTED)
   • I&W: Confirmation: a new China Coast Guard or Southern Theater Command notice names patrols at Scarborough Shoal. (0-14 days)
   • I&W: Break: Philippine Coast Guard maritime awareness reporting records no Chinese Coast Guard, militia or navy vessels near Scarborough Shoal on two consecutive flights. (0-14 days)
2. The Philippine Coast Guard reported observing a Chinese vessel with an orange, sensor-equipped object inside Scarborough Shoal’s lagoon. The object’s function and the vessel’s purpose remain unknown; this account rests on one media report of Philippine Coast Guard observations. (Confidence: low · REPORTED)
   • I&W: Confirmation: the Philippine Coast Guard identifies the object or releases imagery that clarifies its equipment. (0-30 days)
   • I&W: Break: the Philippine Coast Guard reports that its investigation found the object was not sensor-equipped or was not inside the lagoon. (0-30 days)
3. China Coast Guard training by the Dong’an formation at Second Thomas and Sabina Shoals is likely to have occurred, based on CCTV and Tencent News reporting. The specific claims that the training practised vessel interception, boarding and water cannon use remain unverified because official announcements did not disclose the training subjects and the detailed account is from a blog. (Confidence: medium · REPORTED)
   • I&W: Confirmation of the reported tactics: CCTV or a China Coast Guard release explicitly documents interception, boarding or water cannon training at either shoal. (0-30 days)
   • I&W: Break: an official correction states that the Dong’an formation did not train at Second Thomas or Sabina Shoal. (0-30 days)
4. There is a roughly even chance of an unsafe encounter during a Philippine resupply run to Second Thomas Shoal in the next 30 days. China confirmed monitoring a Philippine resupply operation on 21 October, and Manila accused Chinese vessels of obstructing a September mission. The forecast is an inference, not a reported plan or incident; confidence is low because the obstruction claim is a Philippine allegation and the supplied reporting does not establish the timing of the next resupply. (Confidence: low · ASSESSED)
   • I&W: Confirmation: a reported resupply run encounters Chinese Coast Guard blocking, water cannon use, boarding, collision or an unsafe manoeuvre. (0-30 days)
   • I&W: Break: a reported Philippine resupply run reaches the grounded landing ship without Chinese Coast Guard interference or unsafe contact. (0-30 days)

Outlook & scenarios

Continued public signalling without a reported incident (55%)

China continues public patrol announcements around Scarborough Shoal and law-enforcement training near Second Thomas and Sabina Shoals. The Philippine Coast Guard continues monitoring Chinese vessels, but no unsafe encounter or interruption to a resupply run is reported. This is the likely near-term course.

Unsafe contact during a Philippine resupply (37%)

A Philippine resupply run to Second Thomas Shoal draws China Coast Guard monitoring or interference. An unsafe manoeuvre or water cannon use is unlikely, but the reported training and the competing accounts of earlier resupply activity make this a credible alternative.

Injury-producing maritime incident (8%)

An encounter near Scarborough Shoal or Second Thomas Shoal causes injury or damage, interrupts Philippine resupply activity and prompts sharper public statements from Beijing and Manila. This outcome is unlikely but would have high impact.

Recommendations

1. Maintain a dated incident log for Scarborough Shoal, Second Thomas Shoal and Sabina Shoal. Record the reporting source, named vessels and units, reported counts, location and whether activity is officially announced or independently observed.
2. Track Philippine Coast Guard updates on the Chinese vessel and sensor-equipped object inside Scarborough Shoal’s lagoon. Do not infer the object’s function until the Coast Guard or other reporting identifies it.
3. For any reported Second Thomas Shoal resupply, record whether the China Coast Guard monitors, blocks, boards or uses water cannon, and whether the mission completes without unsafe contact.
4. Treat claims about interception, boarding and water cannon training at Second Thomas and Sabina Shoals as unverified unless an official release or other corroborating reporting specifies those activities.

Confidence & uncertainty

Overall confidence is high for the occurrence of the reported patrol announcements, China Coast Guard training publicity and Philippine Coast Guard observations. Multiple major-media accounts and official statements align on the basic events. This does not independently verify every reported movement or exercise detail. The sensor-equipped object is supported by a single media account, the stated training subjects are disputed, and the close-contact forecast is an analytic inference with low confidence.

Alternative analysis (red cell)

The available evidence supports a continuing possibility of friction if another resupply occurs, but it does not support a roughly even chance of an unsafe encounter. Chinese monitoring is confirmed only at medium confidence (20f3ed24-f5b1-4d88-bd63-c84eec133e0a), while the obstruction account is a Philippine allegation (3a428eec-651d-4ba5-8e95-81fcb8deb99c) and the timing of any next mission is unknown. The probability is therefore indeterminate from the supplied reporting rather than demonstrably near 50 percent.

Intelligence gaps

• [EEI 1.1 · PARTIAL] Number, class, and position (time-stamped) of Chinese Coast Guard (CCG), People’s Armed Forces Maritime Militia (PAFMM), and other PRC paramilitary/auxiliary vessels inside Philippine-claimed EEZ or within 12 nautical miles of Philippine-occupied features (e.g., Scarborough Shoal, Second Thomas/Ayungin Shoal, and other named features). Recommended collection: maritime/AIS
• [EEI 1.4 · UNCOVERED] Abrupt changes to vessel identification behavior: AIS transponder deactivations, spoofing, or mismatches between flagged identity and observed equipment/markings among PRC maritime law-enforcement or militia vessels operating near Philippine claims. Recommended collection: maritime/AIS
• [EEI 2.1 · PARTIAL] Issued directives, patrol orders, or internal guidance from PRC Central Military Commission, PLAN, CCG, or provincial maritime authorities that specify objectives, geographic limits, patrol tempos, or escalation thresholds for operations near Philippine-claimed features. Recommended collection: signals/communications
• [EEI 2.2 · UNCOVERED] Public declarations, maritime notices, or newly published 'maritime safety' or exclusion zones, with effective dates and coordinates, issued by Chinese authorities that could be used to justify interdiction or exclusion of Philippine activity. Recommended collection: open-source/official statements
• [EEI 2.3 · UNCOVERED] Evidence of mobilization orders, tasking lists, or logistics planning for Maritime Militia units (vessel requisitions, local fisheries bureau instructions, fuel/resupply manifests) indicating intent to employ militia alongside CCG/PLAN assets. Recommended collection: HUMINT/defense
• [EEI 3.2 · PARTIAL] Air component activity: number and frequency of Philippine air patrol sorties, maritime domain awareness flights, and air-to-surface or maritime strike assets placed on alert or redeployed toward contested areas. Recommended collection: imagery/satellite
• [EEI 3.3 · PARTIAL] Requests for diplomatic, intelligence, or military assistance from allies (e.g., US, Australia, Japan) including notifications of planned joint patrols, port calls, or freedom of navigation operations with dates and participating units. Recommended collection: open-source/official statements
• [EEI 3.4 · UNCOVERED] Changes to Philippine rules of engagement, emergency law measures, mobilization orders, or civil advisories (evacuations, fishing bans) that alter civilian or military behavior in contested maritime zones. Recommended collection: open-source/official statements

Red cell review: PARTIAL DISSENT

TLP:CLEAR