China’s exercises are meant to demonstrate to the United States and its allies that China is ready to fight off the U.S. Navy in the region, said Chieh Chung ( 揭仲) , an associate research fellow at National Policy Foundation, a Taiwanese think tank. They are designed to “convey a strong sense of protest” against American involvement to defend Taiwan, he said.

China’s increasingly frequent entries aim to erode the U.S. Navy’s ability to come to Taiwan’s defense if it came under attacks from China — something Biden has repeatedly said he believes it should do. The United States does not have a formal defense treaty with Taiwan, but it is committed to providing Taiwan, through arms sales and military aid, with weapons to defend itself.

/https://www.washingtonpost.com/world/2023/11/13/china-biden-xi-meeting-apec-taiwan/