File photo of a China Coast Guard vessel. (Photo: VCG)

The China Coast Guard (CCG) warned and expelled a Japanese fishing boat on Tuesday, after it unlawfully intruded into the territorial waters of China's Chiwei Yu, CCG spokesperson Jiang Lue said in a statement.

"Diaoyu Dao and its affiliated islands are China's inherent territory. We urge the Japanese side to immediately stop all violations of rights and provocative acts in relevant waters," Jiang said.

The CCG will continue to conduct rights-protection and law-enforcement operations in the territorial waters of Diaoyu Dao and its affiliated islands and safeguard China's territorial sovereignty and maritime rights and interests.