The Philippines and Japan pledged to enhance their defense alliance through training exercises, logistical activities, equipment transfers and intelligence sharing on Monday amid China’s assertive moves in the South China Sea.

Chinese state media on Wednesday called on the Philippines to withdraw the United States' Typhon intermediate range missile from the South China Sea, saying the Philippines had repeatedly broken its promises by introducing the missile system.

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.

A Chinese military helicopter edged dangerously close to a Philippine plane on patrol over the flash point Scarborough Shoal, an incident witnessed by The Japan Times.

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.

China accused Australia on Friday of deliberately provoking it with a maritime patrol in the disputed South China Sea this week, saying the latter was spreading "false narratives", though Australia maintained its action adhered to international law.

China in turn accused the Australian plane of "deliberately" intruding into airspace over the disputed Paracel Islands,