The secretive state has reportedly been preparing for another Intercontinental Ballistic Missile test-firing – possibly to mark the country’s founding day on Saturday.
Last weekend leader Kim Jong Un detonated the state’s sixth and biggest nuclear weapon in an underground bunker and claimed he could hit the mainland US with nuclear missiles.
Japan yesterday said that Sunday’s nuclear blast was more than nine times more powerful than the blast that devastated Hiroshima in 1945.
President Trump has vowed to retaliate with “fire and fury” to any threat to the US or its allies.
But after a telephone conversation with China’s President Xi Jinping yesterday, Mr Trump softened his tone.

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He has repeatedly called on China, North Korea’s only real ally and main trading partner, to bring the rogue state to heel.
Following the call Mr Trump said military action was not “a first choice but we’ll see what happens”.
He said: “President Xi would like to do something. We’ll see whether or not he can do it. But we will not be putting up with what’s happening in North Korea.
“I believe that President Xi agrees with me 100 per cent … We had a very, very frank and very strong phone call.”