TLP:CLEAR · Disclosure is not limited.

South China Sea: Chinese patrols and coast guard training

Time window: Last 7 days · Audience: General analyst · Type: Situation report · DTG: 2026-10-31 10:07Z · Overall confidence: MEDIUM

BLUF

On 30 October, the PLA Southern Theater Command and China Coast Guard reported patrol activity around Scarborough Shoal, while a separate account described China Coast Guard training at Second Thomas and Sabina Shoals. This indicates a more active declared enforcement posture, but does not establish an imminent attack; the training account lacks independent verification and Chinese and Philippine accounts of maritime operations conflict.

Executive summary

On 30 October, the PLA Southern Theater Command said naval and air units conducted combat-readiness patrols in the territorial sea and airspace of Huangyan Dao (Scarborough Shoal). The China Coast Guard also reported law-enforcement patrols there, and the command said it had strengthened patrols since the start of October. A CCTV-based account relayed by UDN described the Dong'an formation training at Ren'ai Jiao (Second Thomas Shoal) and Xianbin Jiao (Sabina Shoal), including shadowing, route control, small-boat manoeuvres, boarding and water cannon drills. Chinese officials described the patrols as a response to Philippine actions but did not specify which actions. Separate accounts of China’s role in the 8 October medical evacuation and whether Beijing authorised the 21 October resupply remain in dispute.

Change from previous assessment

Since the 30 October prior brief, the assessment has changed from treating China Coast Guard training near Second Thomas and Sabina Shoals as an undated social-media report to recognising a dated, detailed CCTV-based account of the Dong'an formation's exercise. Reporting has also added PLA and China Coast Guard patrol announcements at Scarborough Shoal on 30 October, including the claim that patrols had been strengthened since early October. Confidence in the existence of publicly reported activity rises from low to medium; confidence in Chinese intent remains low, and the new reporting does not establish an imminent confrontation.

Key judgments

1. China's declared operational posture around Scarborough Shoal has intensified: the PLA Southern Theater Command said its naval and air units patrolled Huangyan Dao's territorial sea and airspace on 30 October, while the China Coast Guard reported law-enforcement patrols and the command said patrols had been strengthened since early October. Chinese officials framed the activity as a countermeasure to Philippine actions but did not identify those actions. Confidence is medium because several major-media reports carried the official statements, but they do not independently verify the movements or the stated rationale. (Confidence: medium · REPORTED)
   • I&W: A new PLA Southern Theater Command notice naming naval or air readiness patrols at Huangyan Dao, or a China Coast Guard notice of patrols around Scarborough Shoal, would confirm continued activity. (0-14 days)
   • I&W: A public statement that the strengthened patrols have ended, followed by no reported PLA or China Coast Guard patrols at Scarborough Shoal, would weaken this judgement. (0-14 days)
2. The reported Dong'an formation drill likely gives the China Coast Guard a rehearsed set of tactics for controlling foreign vessels near Second Thomas and Sabina Shoals. The CCTV-based account described reconnaissance, shadowing, route control, small-boat manoeuvres, simulated boarding and inspection, and water cannon and drone drills. This is an assessment of the exercise's operational implications, not evidence that those tactics were used against a Philippine vessel. Confidence is low because the detailed account comes through one CCTV-based report and has no independent verification in the supplied reporting. (Confidence: low · ASSESSED)
   • I&W: A reported or independently documented China Coast Guard boarding, route-control manoeuvre, water cannon use or drone operation against a foreign vessel at either shoal would confirm that the training methods are being applied operationally. (0-30 days)
   • I&W: A China Coast Guard statement that the drill was completed without follow-on deployment, alongside no reported operation using the rehearsed tactics, would weaken the assessment that the exercise signals an active enforcement posture. (0-30 days)
3. A deliberate PLA attack on Philippine forces is unlikely in the next 14 days on the reporting available; an unsafe China Coast Guard and Philippine vessel encounter is the more immediate concern. The supplied reporting describes patrols and enforcement training, not an order or public preparation for an attack. It also records an injury-producing confrontation near Second Thomas Shoal on 20 July and conflicting accounts of the 8 October medical evacuation. Confidence is low because this judgement infers intent from incomplete reporting and the record includes disputed accounts of Chinese and Philippine conduct. (Confidence: low · ASSESSED)
   • I&W: A PLA or China Coast Guard announcement of an operation to block a Philippine resupply to the BRP Sierra Madre, or a documented PLA deployment directly supporting an interception, would break this judgement. (0-14 days)
   • I&W: A Philippine resupply to the BRP Sierra Madre completed without reported China Coast Guard interference and with no reported PLA operational change would support this judgement. (0-14 days)
4. The reported record leaves Beijing and Manila's dispute over authority at Second Thomas Shoal unresolved. China said it permitted the 21 October resupply and the 8 October medical transfer; the Philippine Armed Forces denied that Beijing's permission was needed for the resupply, while Philippine reporting described water cannon use and shadowing during the medical mission, delaying it by nearly 10 hours. The accounts do not establish which version is accurate. Confidence is medium because the competing statements and reports are clearly attributed, but the underlying events are not independently resolved. (Confidence: medium · REPORTED)
   • I&W: Dated mission video or logs showing whether China gave prior authorisation for the 21 October resupply would help resolve the competing accounts. (0-30 days)
   • I&W: Independent video, vessel records or a mutually acknowledged timeline showing water cannon use and the duration of the 8 October delay, or confirming an unimpeded transfer, would resolve the medical-evacuation dispute. (0-30 days)

Outlook & scenarios

Continued patrols and enforcement signalling (55%)

The PLA Southern Theater Command issues further readiness-patrol announcements at Huangyan Dao and the China Coast Guard continues patrols around Scarborough Shoal. China Coast Guard training remains publicly focused on vessel control at Second Thomas and Sabina Shoals, without a reported injury-producing encounter.

Interference during a Philippine mission (25%)

During a Philippine resupply or other mission near Second Thomas or Sabina Shoal, China Coast Guard vessels shadow or impede the Philippine vessel, or use water cannon. Beijing and Manila issue competing accounts, as they did over the 8 October medical evacuation.

Temporary restraint at the shoals (15%)

No new patrol or training announcement follows the 30 October activity. A Philippine resupply reaches the BRP Sierra Madre without reported interference, while Beijing and Manila retain their opposing positions on permission and authority.

Collision or injury during an interception (5%)

A close manoeuvre or boarding attempt by the China Coast Guard near Scarborough, Second Thomas or Sabina Shoal results in a collision or injury to Philippine personnel. Both governments issue sharply conflicting accounts, raising pressure for further patrols.

Recommendations

1. Maintain a dated activity log for PLA Southern Theater Command patrol announcements and China Coast Guard operations at Scarborough, Second Thomas and Sabina Shoals. Separate official claims from independently corroborated vessel or aircraft activity.
2. Prioritise collection on Philippine resupply and medical missions to the BRP Sierra Madre. Record vessel identities, approach distances, boarding attempts, water cannon use, route control, delays and injuries, and compare Chinese and Philippine accounts against available imagery or logs.
3. Seek independent corroboration of the Dong'an formation exercise and monitor whether China Coast Guard units use the reported shadowing, small-boat, boarding or drone tactics during real operations.
4. Track public statements from Beijing and Manila on the 21 October resupply and 8 October medical evacuation as competing accounts until documentary evidence resolves the discrepancies.

Confidence & uncertainty

Overall confidence is medium because several major-media reports carried official Chinese statements about the 30 October patrols, but those reports do not independently verify the movements. The detailed Dong'an formation account is based on one CCTV-derived report relayed by UDN. Chinese and Philippine accounts of the 8 October medical evacuation and 21 October resupply conflict, leaving operational details and intent uncertain.

Alternative analysis (red cell)

The available reporting may indicate more than an immediate risk of an unsafe encounter: intensified patrols and the Dong'an training could reflect deliberate preparation for coercive action against Philippine forces, even without a publicly visible attack order. Conversely, the record does not establish that an attack is likely, so the strongest defensible alternative is that the 14-day risk remains indeterminate between coercive enforcement and a more serious confrontation.

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 3.1 · PARTIAL] Deployment and movement of Philippine Coast Guard and Navy vessels (class, location, on-station times) and scheduled or unscheduled escort/resupply missions to occupied features. Recommended collection: military/AIS
• [EEI 3.2 · UNCOVERED] 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