The US and South Korea have prepared for more joint military drills, angering the North, and experts said Pyongyang could still go ahead with its plan.
President Xi’s comments came hours after President Trump warned North Korea that the US military was “locked and loaded”.
Guam posted emergency guidelines on Friday to help residents prepare for any potential nuclear attack after North Korea threatened to fire four missiles near the US territory’s shores.
The comments from the influential Global Times came after US President Donald Trump stepped up his rhetoric against North Korea again on Thursday
The sharp increase in tensions rattled financial markets and prompted warnings from US officials not to engage in slanging matches with North Korea.
North Korea tested ballistic missiles at an unprecedented rate last year and Kim Jong Un says they are close to testing an intercontinental ballistic missile.
Tension in Northeast Asia has been high since North Korea conducted its fourth nuclear test in January, and followed that with a satellite launch and test launches of various missiles.