CHINA WARNS OFF PHILIPPINE AIRCRAFT OVER SCARBOROUGH SHOAL — AND MANILA CALLS IT A FARCE

"The actions of the Philippine side, seriously infringing upon China's sovereignty, are highly likely to lead to misunderstandings and misjudgments."

That was Senior Captain Zhai Shichen, spokesman for the People's Liberation Army Southern Theater Command, announcing on March 18, 2026, that Chinese naval and air forces had warned and expelled two Philippine C-208B Cessna aircraft it claimed had "illegally intruded into the territorial airspace over China's Huangyan Dao without government approval."

The Philippines' response was swift: a farce.

WHAT HAPPENED ON MARCH 18

The Philippine Coast Guard, under Admiral Ronnie Gil Gavan, had deployed vessels and an aircraft to Scarborough Shoal — known in Manila as Bajo de Masinloc — after Filipino fishermen reported harassment by Chinese ships.

The mission was described as routine: secure the area, deliver fuel, ice, and food to Filipino fishermen already there.

What the PCG encountered were at least five China Coast Guard vessels — including CCG ships 21605, 3107, and 3103 — three PLA Navy ships, and suspected maritime militia vessels. Chinese crews deployed rigid hull inflatable boats and repeatedly sounded sirens to drive Filipino fishermen away from the area.

During the patrol, a PLA Air Force asset challenged a PCG maritime patrol aircraft. Inquirer described it as the first such PLA Air Force intercept recorded at the shoal.

BEIJING'S CLAIM, MANILA'S REJECTION

China's PLA Southern Theater Command said its forces acted "in accordance with the law and regulations" and warned that Philippine actions were "highly likely to lead to misunderstandings and misjudgments." Zhai demanded that Manila "immediately stop infringement and provocations."

The Department of National Defense rejected the characterization entirely on March 19, calling Philippine maritime operations lawful and accusing Chinese Air Force aircraft of "dangerous and provocative actions" against Philippine Air Force aircraft over Scarborough Shoal.

DFA Maritime Affairs Spokesperson Rogelio Villanueva Jr. had already laid out Manila's legal position the week prior: "China must be reminded that maritime and territorial claims are subject to established international legal procedures and dispute settlement mechanisms, not through unilateral proclamations or social media posts."

Foreign Affairs Secretary Ma. Theresa Lazaro was even more direct, citing the 2016 Permanent Court of Arbitration ruling: "Yes, it's part of our territory. Exactly. And we have our sovereign rights over there."

THE LEGAL PICTURE

The 2016 PCA ruling at The Hague found China's nine-dash line claim had no basis in international law. The tribunal classified Scarborough Shoal as a "rock" under Article 121(3) of the United Nations Convention on the Law of the Sea — meaning it generates a 12-nautical-mile territorial sea but cannot generate an exclusive economic zone or continental shelf.

That places the shoal squarely within the Philippines' 200-nautical-mile EEZ. Scarborough sits roughly 124 to 232 kilometers west of Luzon. China's nearest island province, Hainan, is approximately 650 kilometers away.

China rejected the arbitration, refused to participate, and has consistently dismissed the ruling as invalid. Beijing's own escalating legal moves — announcing baselines around the shoal in November 2024, depositing those baselines at the United Nations in December 2024, and designating the shoal a national nature reserve in September 2025 — signal it has no intention of stepping back.

A PATTERN, NOT AN EXCEPTION

The March 18 incident is the seventh aerial confrontation at or near Scarborough Shoal since August 2024.

A PLA Air Force multirole jet dropped flares in the path of a Philippine NC-212i aircraft in August 2024. A Chinese Navy Z-9 helicopter flew within three meters of a BFAR Cessna 208B in February 2025, with Philippine journalists on board. China announced it drove away Philippine aircraft in December 2025 and again in January 2026.

Just weeks before the March 18 incident, a Chinese Navy warship challenged a PCG patrol aircraft over Bajo de Masinloc on February 23, and an ABS-CBN News team on board a PCG aircraft captured radio challenges from a Chinese warship on March 7.

Two days after the March 18 incident, China announced a separate expulsion of a Philippine C-208B near Mischief Reef in the Spratly Islands.

The shoal has been under de facto Chinese control since 2012, when Beijing seized it following a two-month standoff with the Philippine Navy. Filipino fishermen have faced restricted access ever since.

THE MDT QUESTION

The 1951 US-Philippines Mutual Defense Treaty, under Article V, covers armed attacks on Philippine "armed forces, public vessels, or aircraft" anywhere in the Pacific — a definition the 2023 Bilateral Defense Guidelines explicitly extended to "anywhere in the South China Sea."

After the February 2025 helicopter intercept, the US Mission to ASEAN invoked that language directly, condemning what it called "unsafe and irresponsible actions" by the PLA Navy and affirming that the MDT applied to Philippine Coast Guard aircraft operating in the South China Sea.

No equivalent US statement on the March 18 Scarborough incident had been issued as of March 22, 2026.

The critical legal threshold remains an "armed attack." China's warning-off operations — radio challenges, intercepts, flare drops, and now a formal expulsion announcement — have so far stopped short of that line.

The question is how much further this pattern can go before that threshold becomes relevant.