The Philippine Navy on Friday said it held drills near a disputed South China Sea shoal, where a large Chinese vessel was spotted patrolling.

MANILA, Philippines — 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.

Tensions between Beijing and Manila have intensified in recent months concerning the South China Sea, a region spanning 3.5 million square kilometers (1.35 million square miles) through which an estimated $11.3 billion in global trade passes annually, according to the Center for Strategic and International Studies.

The Philippines and China agreed to seek common ground and find ways to cooperate despite their disagreements in the South China Sea, their foreign ministries said on Thursday, as heated rows persist over vessels deployed around disputed features.