Trump warned the Hermit Kingdom’s hierarchy that it faced destruction if it did not abandon its nuclear weapons programme.
But the tubby tyrant has vowed to continue developing missiles, until one has the range to hit New York.
In response, Trump has placed his B-52 bomber planes on 24-hour alert status, a move not seen since the Cold War ended in 1991.
Air Force chief of staff General David Goldfein said: “This is yet one more step in ensuring that we’re prepared.
“I look at it more as not planning for any specific event, but more for the reality of the global situation we find ourselves in and how we ensure we’re prepared going forward.”
General Goldfein added that preparations for the alert order were all under way.
He also said that that the Airforce is being tasked to find ways of using nuclear weapons as a deterrence or even in combat.
He also said: “The world is a dangerous place and we’ve got folks that are talking openly about use of nuclear weapons.
The B-52s were placed on alert for decades when the US was faced with the dangers of the Soviet Union.
The measure comes after two nuclear B1-B bombers were flown over South Korea, to send a message to the despot nation.