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.

U.S. President Joe Biden on Sunday met virtually with his counterparts from Japan and the Philippines to advance cooperation among the three countries, the White House said.

The Philippines said a huge Chinese coast guard ship widely known as the “Monster” has returned to its exclusive economic zone in the South China Sea, prompting its own coast guard vessel to approach and issue a radio challenge.

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.

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.

A Chinese coastguard ship patrolled Scarborough Shoal on Tuesday pushing the Philippines “to the wall,” and prompting Manila to consider international lawsuits.