A Philippine security official says China is “pushing us to the wall” with growing aggression in the disputed South China Sea and warned that “all options are on the table” for Manila’s response, including new international lawsuits.

The Philippines has threatened international lawsuits against China for the action, which it says is another sign of the country's ongoing aggression in the area.

The Philippines accused China on Tuesday of intimidating its fishermen at a disputed South China Sea shoal, and normalizing an “illegal presence,” after Beijing sent its largest coast guard vessel into Manila’s maritime zone.

The Philippine Coast Guard on Wednesday said that China's "monster ship" deployed off Zambales in Luzon was so far Beijing's closest vessel yet to the Philippine coastline.

Growing tensions between China and the Philippines in the disputed Scarborough Shoal in the South China Sea are reaching a boiling point, Manila officials say.