The weapons were reportedly spotted using new satellite imagery.
Rodrigo Duterte has only been in office a few months in the Philippines but is giving Donald Trump a run for his money as the most bombastic and outrageous political figure on the global media stage.
Towers and hexagonal structures have also been built on the islets in recent months.
MANILA, Philippines -- Duterte is willing to talk to China, and China must read his lips.
BEIJING -- What we are witnessing is in reality a fight to safeguard international standards of law and the rule-based world order.
China's expansionist designs on the region's strategic shipping lanes and untapped natural resources are turning it into the next global hotspot.