BEIJING - China on Sunday voiced strong dissatisfaction and firm opposition to two US warships trespassing China's territorial waters off the Xisha Islands.

Foreign Ministry spokesperson Lu Kang said in a statement released on Sunday night that the US warships trespassed into China's territorial waters off the Xisha Islands on Sunday without permission of the Chinese government, and the Chinese navy identified the US warships, warned and expelled them.

"The Chinese side strongly urges the US side to immediately stop such kind of provocative operations that violate China's sovereignty and threaten China's security," Lu said.