A helicopter takes off from the Chinese navy's missile destroyer DDG-112 Harbin to conduct an anti-submarine mission during a China-Russia joint sea exercise held from April 22 to 27 in the Yellow Sea. [Photo/Xinhua]

QINGDAO - Chinese and Russian warships joined a drill Thursday morning in the Yellow Sea of the Pacific Ocean.

A total of 13 warships, four helicopters and two teams of special forces participated in the drill, focusing on marine escorts and anti-hijacking activities which involved no weapons. The drill lasted 67 minutes.

The naval exercise would also see live-fire operations as it was scheduled.

A helicopter flies over a warship during a China-Russia joint sea exercise held from April 22 to 27 in the Yellow Sea.[Photo/Asianewsphoto]