Xi Jinping

Chinese President Xi Jinping on Saturday asked his US counterpart Donald Trump to avoid remarks and actions that could escalate the already-tense situation in the Korean Peninsula as the two leaders reaffirmed their commitment to denuclearise the region.

The two leaders spoke over phone to discuss the escalating tension after North Korean lea-der Kim Jong-Un threatened the US this week to fire missiles at Guam, a US island territory, after the US sponsored a resolution imposing new economic sanctions on Pyongyang over its missile and nuclear weapons programmes.

Xi told Trump that China is ready to work with the US to "appropriately resolve" the issue, state-run Xinhua news agency reported.

"The relevant side must at present exercise restraint, and avoid words and actions that exacerbate tensions on the Korean peninsula," the report quoted Xi as saying.

Meanwhile, recent satellite images suggest North Korea could be preparing for fresh submarine-based ballistic missile tests, an expert in North Korean defence and intelligence said on Friday.