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The US is on the brink of nuclear war amid threats from Kim Jong-un and Vladimir Putin moving his arsenal into firing range, experts have warned.

The Donald has previously promised to "meet fire with fire", and a Pentagon spokesman confirmed any nuke fired from North Korea would be shot out of the sky.

But the new US president revealed his fears of the devastating results of a nuclear war after being handed the codes.

(Image: GETTY) (Image: GETTY)

He said today: "When they explain what it represents and the kind of destruction that you're talking about, it is a very sobering moment, yes.

"It's very, very scary, in a sense."

Despite the unusual lack of confidence, Trump denied the nuclear codes were causing him to have some sleepless nights.

The billionaire former reality star said: "I have confidence that I'll do the right thing, the right job. But it's a very, very scary thing."

The property tycoon is now officially in charge of the "gold codes", which can initiate a nuclear attack in as little as 30 seconds.

It would then take four minutes for the order to arrive with those responsible for launching the missiles.

Tubby tyrant Kim Jong-un has threatened the US several times with firing a long-range missile from the despot nation, which could cause devastation in the merican heartland.

The US military has responded by sending a team of their elite F-35B Lightning II jet fighters to bases in Japan.