China's President Xi Jinping told his U.S. counterpart Joe Biden that the issues of Taiwan, democracy, human rights and rights to development are "red lines" for China and not to be challenged, the official state media Xinhua said on Sunday.

At the APEC summit, Chinese President Xi Jinping cautioned the United States against supporting Taiwan's independence, calling it a "red line." While emphasizing areas of potential conflict, Xi also expressed willingness to work with the incoming Trump administration for a smooth transition in US-China relations.