TACTICAL nuclear weapons could be moved on to North Korea’s doorstep, the US defence secretary has shockingly confirmed.

Kim Jong-un has risked starting World War 3 with his terrifying nuclear missile programme.

He has threatened to use his nukes, which could now reach anywhere in the US, to blow up America and their allies Japan, and South Korea.

To fight back against the tubby tyrant, South Korea has asked the US to move tactical nukes into the Korean peninsula.

US defence secretary James “Mad Dog” Mattis confirmed he had discussed the move with South Korean defence minister Song Young-moo.

Song and South Korea are believed to have pushed for the introduction of missiles, calling it “alternative worth a full review”.

Speaking to reporters at the Pentagon, Mattis confirmed the discussion had taken place but would not comment on if or when the nukes would be moved.

He said: “It’s simply a longstanding policy so the enemy, our adversaries, never know where they’re at.

“It’s part of the deterrent that they cannot target them all. There’s always a great big question mark.”

This move would aggravate the rotund ruler, who has already demanded the US remove all their forces in the Korean peninsula.

Tactical nuclear weapons are often designed to hit targets such as bunkers and tunnels, so could be used to wipe out the North’s nuclear facilities.

They are still considered immensely powerful in their own right and a potential gateway to larger nuclear attacks.

Air Force General John Hyten, who oversees U.S. nuclear weapons as the chief of U.S. Strategic Command, warned using nuclear weapons in any format would bring “significant consequences”.