China's Defense Ministry says the US action seriously violated peace and stability in the area. A Ministry spokesman said in a statement released Saturday that the US warship knowingly entered China's territorial waters, making it a blatant provocation.
The statement said the action violated China's Law on the Territorial Sea and Contiguous Zone, which requires foreign military ships to obtain permission from the Chinese government before entering China's territorial waters.
The statement also said the US action disturbed peace and order in the area, and undermined regional peace and stability. The Defense Ministry said China will take all necessary measures to safeguard its sovereignty and national security.