China's military said on Friday it conducted a routine patrol in the South China Sea from February 23 to 26, and accused the Philippines of "disrupting" peace and stability by organising joint patrols with countries outside the region.
The military's Southern Theatre Command will, "resolutely safeguard China's territorial sovereignty and maritime rights and interests, and firmly uphold regional peace and stability," spokesperson Zhai Shichen said in a statement.
The navies of the Philippines, the US and Japan trained alongside each other in the South China Sea this week to ramp up cooperation among the military allies, the Philippines' armed forces said on Friday.
The Philippines deployed its Antonio Luna frigate, helicopters and fighter jets to the joint drills. Japan deployed a P-3 Orion aircraft while the US sent guided-missile destroyer USS Dewey and a Poseidon plane.
Exercises included replenishment at sea, joint air patrols, fly-bys and communications check exercises.
China claims most of the resource-rich waterway, rejecting a 2016 arbitral award that has voided its historical claims to the area.
(Reporting by Beijing Newsroom; Editing by Jacqueline Wong)