Foreign Affairs Secretary Perfecto Yasay Jr. yesterday said the Philippines has filed sent diplomatic notes to China to seek clarification on several issues, including the installation of anti-aircraft and anti-missile systems at its man-made islands in the disputed South China Sea. Yasay said DFA decided to send the note verbale instead of a diplomatic protest because it is the appropriate action at this moment. Citing satellite images, the CSIS-AMTI said it appeared that China has installed large anti-aircraft guns and probable close-in weapon systems at Gaven, Hughes, Johnson, Cuarteron, Fiery Cross, Mischief, and Subi reefs.

Hachero, A., Montemayor, J., & Reyes, V. (2017, January 18). Note verbale sent to China, says Yasay. Malaya Business Insight, pp.B1, B6.