PLA Exercise Near Scarborough Shoal

China's PLA Southern Theater Command conducted a joint naval and air exercise in waters and airspace surrounding Scarborough Shoal — five days after the Xi-Trump summit concluded.

Xi-Trump State Visit, Washington D.C.

Xi Jinping concluded a state visit to Washington. Talks produced symbolic gestures — including panda diplomacy — but no known binding agreements on South China Sea maritime behavior.

Knife Confrontation at Second Thomas Shoal

Chinese personnel intercepted Philippine resupply boats, reportedly using knives to slash inflatables and seize supplies and equipment. The Philippines called it an illegal act and a severe escalation.

U.S.–Philippines–Japan Trilateral Summit

Presidents Biden and Marcos and Prime Minister Kishida held the first trilateral leaders' summit at the White House, issuing a joint statement affirming that the U.S.–Philippines Mutual Defense Treaty applies to armed attacks in the South China Sea.

China Water-Cannons Philippine Resupply Mission

Chinese coast guard vessels fired water cannons at Philippine boats conducting a routine resupply mission to the grounded BRP Sierra Madre at Second Thomas Shoal, injuring sailors.

PLA Vessel Uses Laser on Philippine Coast Guard

China's coast guard directed a military-grade green laser at the Philippine vessel BRP Malapascua near Ayungin Shoal, temporarily blinding crew members. The Philippines published video evidence.

220 Chinese Vessels Mass at Whitsun Reef

Philippine authorities reported a fleet of approximately 220 Chinese maritime militia vessels anchored at Julian Felipe (Whitsun) Reef inside the Philippine EEZ, triggering diplomatic protests.

Chinese Vessel Rams Philippine Fishing Boat

A Chinese vessel struck and sank the Philippine fishing boat Gem-Ver near Reed Bank, leaving 22 Filipino fishermen stranded. The incident drew sharp condemnation from Manila and Washington.

China Installs Weapons on Artificial Islands

CSIS AMTI imagery confirmed anti-ship cruise missiles and surface-to-air missile systems deployed on Fiery Cross, Subi, and Mischief Reefs — militarization Beijing had previously denied.

Tribunal Rejects Nine-Dash Line

The Permanent Court of Arbitration ruled unanimously that China's nine-dash line has no legal basis under international law and that China had violated Philippine sovereign rights. Beijing declared the ruling 'null and void.'

Philippines Files UNCLOS Arbitration

The Philippines initiated arbitral proceedings under UNCLOS Annex VII, challenging China's nine-dash line and its interference with Philippine rights in the exclusive economic zone.

China Seizes Scarborough Shoal

Chinese coast guard vessels blocked Philippine fishing boats from the shoal following a standoff. China has maintained effective control ever since, barring Philippine fishermen for extended periods.