GETTYUS Air Force B-1B Lancer flies near North Korea
It comes after Kim Jong-un made a rare personal announcement that President Donald Trump will "pay dearly" for his threats and that North Korea was considering the "strongest possible response" – later revealed as hydrogen bomb detonation in the Pacific.
The Pentagon said it was a display of force designed to show Kim Jong-un the range of military options available to President Trump.
This is the furthest north any US aircraft has flow of the Demilitarised Zone (DMZ) in the 21st century.
Pentagon spokeswomen Dana White said the US were taking North Korea’s reckless behaviour seriously after Trump’s comments angered the North Korean dictator.Related articles
Dana White added: "This mission is a demonstration of US resolve and a clear message that the President has many military options to defeat any threat.
"We are prepared to use the full range of military capabilities to defend the U.S. homeland and our allies.”
The Pentagon said the B-1B Lancer bombers came from Guam and the US Air Force F-15C Eagle fighter escorts came from Okinawa, Japan.
The patrols came after experts said a earthquake near North Korea's nuclear test site was probably not man-made, easing fears Pyongyang had exploded another nuclear bomb just weeks after its last one.
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North Korea's intercontinental ballistic missile (ICBM), Hwasong-14 being lauched at an