Manila is ready to take “diplomatic action” against Beijing if reports of Chinese military planes in Panganiban Reef are confirmed, Foreign Affairs Secretary Alan Cayetano said. Panganiban Reef, also known as Mischief Reef, is within the country’s exclusive economic zone in the West Philippine Sea.

Cruz, M. V. (2018, April 19). Diplomatic protest vs China eyes — Cayetano. Manila Standard, p. A3.