A Philippine plane warned a Chinese military helicopter over the South China Sea that it was "flying too close," as tension between the U.S. ally and Beijing soars.

A Chinese military helicopter flew within 10 feet (3 meters) of a Philippine patrol plane over the South China Sea on Tuesday, in what observers said was the second incident of potentially catastrophic behavior by the People’s Liberation Army against foreign aircraft in a week.

This is the tense moment a Chinese navy helicopter flew dangerously close to a Philippine patrol aircraft flying over disputed waters in the South China Sea. Footage shows the Chinese chopper hovering just 10ft away from the Filipino plane in the contested Scarborough Shoal,