The actions of the United States and Canada disrupted the peace and stability of the Taiwan Strait, a Chinese military spokesperson said.The Eastern Theater Command of the Chinese People's Liberation Army remains on high alert at all times, and resolutely safeguards national sovereignty and security, as well as regional peace and stability, said Li Xi, a spokesperson with the command, in response to US and Canadian warships' sailing through the strait on Sunday.On Sunday, the US destroyer Higgins and the Canadian frigate Vancouver made a transit through the strait, the spokesperson said.Naval and air forces organized by the command closely followed and monitored the vessels' passage through the strait during the entire process, and addressed the situation in accordance with laws and regulations, Li said.Taiwan has long been one of the most contentious issues in US-China relations.