BEIJING - China on Tuesday made representations to Japan over right-wing activists' landing on the Diaoyu Islands.

"Japanese right-wing activists' illegal landing on the Diaoyu Islands is a serious provocation that infringes on China's territorial sovereignty, thus China has made solemn representations to Japan and demanded that the country explain its endorsement of right-wing activists," Foreign Ministry spokesman Hong Lei said.

Hong's comments followed reports that two Japanese activists landed on the Diaoyu Islands on Tuesday.

Hong urged Japan to take effective measures and stop any acts that may intensify tension over the islands.

Hong said China reserved the right to take further actions.