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.

Chinese leader Xi Jinping on Saturday told President Biden that Beijing remains committed to stable relations with the U.S., an expression of hope for continuity in ties before Donald Trump returns to the Oval Office in the midst of promises to squeeze Beijing over trade.