THE US Air Force flew two powerful nuclear-capable B-1B bombers over South Korea this morning in a show of strength to the neighbouring rogue state of North Korea.

The move came just days after trigger-happy tyrant Kim Jong-un bragged his army could now fix a nuclear warhead to their ballistic missiles.

That possibility hugely increases fears for Washington's allies in the region and also poses a threat to US bases in South Korea, Japan and Guam.