US President Donald Trump has told his secretary of state that he is wasting his time trying to negotiate with North Korea over its nuclear programme.
“Save your energy Rex, we’ll do what has to be done!” Mr Trump tweeted, after it emerged the US had lines of communication with Pyongyang.
Rex Tillerson disclosed the development on Saturday, saying North Korea had little interest in dialogue.
The two countries have engaged in heated rhetoric in recent months.
The US wants North Korea to halt its weapons programme, which has seen it perform repeated missile tests, as well as claim to have successfully tested a miniaturised hydrogen bomb which could be loaded on to a long-range missile.
But attempts at dialogue seem to be at odds with President Trump’s own attitude to the issue.