WASHINGTON (REUTERS, BLOOMBERG) - US President Donald Trump said on Sunday (Dec 8) that North Korean leader Kim Jong Un risks losing "everything" if he resumes hostility and his country must denuclearise, after the North said it had carried out a "successful test of great significance."

"Kim Jong Un is too smart and has far too much to lose, everything actually, if he acts in a hostile way. He signed a strong Denuclearisation Agreement with me in Singapore," Trump said on Twitter, referring to his first summit with Kim in Singapore in 2018.

"He does not want to void his special relationship with the President of the United States or interfere with the US Presidential Election in November," he said.

North Korea has carried a "very important" test at its Sohae satellite launch site, state media KCNA reported, a rocket testing ground that US officials once said Pyongyang had promised to close.

The outcome of the test was "successful" and will play a key part in changing North Korea's strategic position in the near future, the state-run Korean Central News Agency said in a statement Sunday, citing a spokesman at the Academy of the National Defense Science. It didn't elaborate or say what was tested.