The Philippines has turned towards its longstanding military alliance with the US after multiple confrontations with China in the waters of the South China Sea.

Manila and Washington have a mutual defence treaty and the US is concerned not only about the South China Sea, a major international trading route, but also Taiwan, which is claimed by Beijing.

“We need to upgrade our defence posture,” Rodrigo Lutao, public information officer for the army’s Northern Luzon Command, which also covers Batanes, told Al Jazeera.

“We’ve realised the islands of Batanes, especially Mavulis, are strategic areas where we can place our forces and defence materials.”