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South China Sea flashpoints this week – satellite data vs. official narratives


Commercial satellite constellations—PlanetScope, Maxar and the EU’s Sentinel‑2—captured an unusually busy week over the contested Spratly and Paracel chains, contradicting, clarifying and at times corroborating the official lines issued by Beijing, Manila, Washington and Hanoi.




1. Second Thomas Shoal (Ayungin)

Satellite view, 19 Apr: Two 50‑metre China Coast Guard (CCG) cutters flanked the rusting BRP Sierra Madre, Philippines’ beached outpost, while at least four “maritime militia” trawlers formed an outer cordon. A Philippine Navy RHIB is visible approaching with resupply crates.
Official narratives:

Philippines: “Harassment manoeuvres, including water‑cannoning.”

China: “Necessary navigation controls; no force used.”
Reality check: High‑res imagery shows water plumes consistent with cannon bursts trailing the RHIB—supporting Manila’s claim. No hull‑to‑hull contact evident.


2. Cuarteron Reef Airstrip

Satellite view, 20 Apr: One KJ‑500 airborne early‑warning aircraft and two J‑11B fighters parked on China’s 3 km runway—first J‑11 sighting here since January.
Official narratives:

China: “Routine training.”

U.S. Indo‑Pacific Command: Called it a “temporary forward deployment” signalling power projection toward the Malacca Strait.
Reality check: No munitions loaders or fuel bowsers present, suggesting a short‑duration drill rather than permanent staging.


3. Vanguard Bank, western Spratlys

Satellite view, 21 Apr: Vietnam’s Hai Duong 98 seismic vessel operating within its EEZ, escorted by four Vietnam Fisheries Surveillance ships; shadowed by two CCG hulls.
Official narratives:

Vietnam: Filed diplomatic note citing “illegal obstruction of hydrocarbon survey.”

China: Claimed Hai Duong 98 “entered Chinese jurisdiction.”
Reality check: AIS data plotted against UNCLOS EEZ boundaries places the survey line 120 km inside Vietnam’s EEZ, outside China’s nine‑dash line by international standards.


4. Mischief Reef Dredging Return

Satellite view, 18‑22 Apr time‑series: A dredger and two barges reactivated lagoon reclamation on the northeast rim—first new land‑moving activity since mid‑2023.
Official narratives: Silence from Beijing; U.S. State Department called it “troubling.”
Reality check: Pixel‑based sediment‑plume analysis estimates 30,000 m³ moved in four days—minor compared to 2015‑17 megadredging but a sign of resumed expansion.



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