North Korea said it had conducted another test at a satellite launch site on Friday to bolster its strategic nuclear deterrence, North Korean state media outlet KCNA reports.

China has ordered North Korean companies in the country to shut down by January as it applies UN sanctions imposed following Pyongyang's sixth nuclear test, the commerce ministry says.

Chinese state media says President Xi Jinping has called for restraint when dealing with North Korea during a telephone call with President Donald Trump.