The Philippines may lodge a protest with China against the reported presence of two military aircraft on a Chinese built island in the South China Sea, the top Philippine diplomat said, amid concerns that China is militarizing the waterway. The Philippine Daily Inquirer published pictures on Wednesday that it said showed two military transport aircraft on the tarmac of Mischief Reef, which the Philippines claims. The photos were taken in January. Philippines National Security Adviser, Hermogenes Esperon Jr., told reporters on Wednesday that the government does not see the landing of China’s military planes on Philippine-claimed Mischief Reef (Panganiban Reef) as a threat but still considers it as a matter of concern.