Four China marine surveillance ships patrolled the waters off the Diaoyu Islands on Oct 2 in response to the Japanese righter-wingers' intrusion, the Foreign Ministry confirmed. [Photo/China Daily]

Chinese maritime surveillance ships conducted Tuesday another patrol in waters off the Diaoyu Islands, keeping close watch on the illegal entrance of the Japanese right-wingers in the areas, according to the State Oceanic Administration.

Four Chinese marine surveillance ships patrolled in the waters off the Diaoyu Islands on Tuesday after the Japanese right-winger's intrusion, the Foreign Ministry also confirmed.

China is strongly dissatisfied with and firmly opposes the Japanese right-wingers' illegal entrance into the waters off the Diaoyu Islands and is keeping high vigilance to their intention and purpose, FM spokesman Hong Lei said Tuesday at a regular press briefing.

The provocation of this kind will make the situation more complicated if not stopped, said Hong Lei.

The patrol team - composed of Haijian 50, Haijian 15, Haijian 26 and Haijian 27 - are carrying out normal rights-safeguarding activities around the Diaoyu Islands, according to a statement from the State Oceanic Administration.