“The Chinese coastguard closely monitored, warned and drove the aircraft away according to the law.”
Scarborough Shoal, known as Panatag Shoal in the Philippines, is controlled by Beijing but also claimed by Manila.
It has been a flashpoint between the two countries since last year.
“Huangyan Island is China’s inherent territory, and the actions of the Philippine side severely infringe upon China’s sovereignty and pose high risks of maritime and air incidents,” Liu said.