China adds patrol ships to safeguard maritime interests.

中国增加了海上巡逻舰艇，以保障海上权益。

youdao

Patrol ships monitored the noise made by submarines in the vicinity.

巡逻船只监测附近潜水艇所发出的声音。

youdao

European leaders are holding emergency meetings and increasing the number of patrol ships to address the problem.

欧洲领导人召开紧急会议，增加巡逻船来解决这一问题。

youdao

Japanese Vice Foreign Minister Chikao Kawai, the highest-ranking foreign ministry bureaucrat, summoned Chinese ambassador Cheng Yunghua to complain about the intrusion of patrol ships.

WSJ: China, Japan Island Spat Resurfaces

Japan also appears to be looking to reinforce its capabilities in the area - public broadcaster NHK reported on Monday that two more patrol ships will be deployed to the area later in the year.

BBC: China 'to survey disputed East China Sea islands'

The Americans have their own ships on patrol, as do the Chinese, the Indians, Russians and several other countries.

ECONOMIST: Pirates kidnap 20 American sailors off the coast of Somalia