The Foreign Ministry warned that a visit by the US House of Representatives Speaker Nancy Pelosi to Taiwan would "seriously threaten the peace and stability" of the Taiwan Strait if it goes ahead.
"If House Speaker Nancy Pelosi visits Taiwan, China will take resolute and strong counter-measures to defend its sovereignty and territorial integrity," spokesman Zhao Lijian said.
Asked what kind of measures the PLA might take, Zhao said: "if she dares to go, then let us wait and see.”
Pelosi kicked off her Asian tour in Singapore on Monday.
She and her delegation met with Singapore Prime Minister Lee Hsien Loong, discussing issues including cross-strait relations, the Ukraine war and climate change, Singapore's foreign ministry said.
"PM Lee highlighted the importance of stable US-China relations for regional peace and security," it said. (Agencies)