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.

Disputed South China Sea airspace that Beijing claims as its own falls within Manila’s Exclusive Economic Zone, where the Philippines and other countries enjoy freedom of overflight.

A Chinese navy helicopter flew within 10 feet of a Philippine patrol plane on Tuesday in a disputed area of the the South China Sea, as the Filipino pilot warned by radio: “You are flying too close, you are very dangerous.