The leaders agreed that humans should control decisions to use nuclear weapons — not AI. And they talked about the importance of stability during the transition to a new U.S. administration.

President Joe Biden and his Chinese counterpart, Xi Jinping, closed the book on their diplomatic relationship Saturday, meeting for a final time amid uncertainty over what the next Donald Trump presidency might portend for their two countries’ ties.

Chinese President Xi Jinping warned President Biden not to cross four “red lines” regarding Taiwan and the communist system as the outgoing president called for continued communications.

Donald Trump has made a tougher stance toward China central to his pitch on foreign policy, even as Joe Biden and Xi Jinping sought to lower tensions before the next president takes office.

LIMA | Xinhua | Chinese President Xi Jinping on Saturday met with U.S. President Joe Biden on the sidelines of the 31st APEC Economic Leaders’ Meeting in Lima, Peru. Noting that he was pleased to meet with Biden again,

Mr. Biden seems more impassioned about preserving the near-mystical ‘spirit of Camp David’ than in disputes with China.

The two leaders’ final sit-down, at a summit in Peru, is marked by uncertainty over Trump’s tariff threats.

Chinese President Xi Jinping vowed to work with President-elect Trump's administration during a meeting with President Biden in Lima, Peru, on Saturday.

Analysts say Chinese leader’s stern words about ‘red lines’ are meant for US president-elect, who is assembling cabinet of China hawks.