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.

Footage release by the Philippine coast guard shows a Chinese navy helicopter flying close to a Philippine aircraft patrolling over a disputed area of the South China Sea on Tuesday, 18 February. According to the coast guard,

A Chinese navy helicopter flew within 10 feet of a Philippine patrol plane over the disputed Scarborough Shoal in the South China Sea; the plane did not have to alter its path to avoid a collision.