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 and, on 3 September, the test of a miniaturised hydrogen bomb which could be loaded on to a long‑range missile, which Pyongyang said was successful.
But attempts at dialogue seem to be at odds with President Donald Trump's own attitude to the issue.
Yesterday, he tweeted, in reference to North Korean leader Kim Jong‑un: "I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man..."
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