China's President Xi Jinping has urged Donald Trump and North Korea to avoid "words and actions" that worsen tensions, state media say.
But China, North Korea's only major ally, has been urging restraint.
A White House statement said the US and China agreed North Korea must stop "provocative and escalatory behaviour".
A statement by North Korea's official KCNA news agency issued on Saturday said the Trump administration "had better talk and act properly," if it did not want "the American empire to meet its tragic doom".
Read more: North Korea: China urges Trump not to worsen situation - BBC News