THE US has mobilised a fleet of missile capable drones to blitz North Korea amid warnings it is running out of bombs to hit ISIS.

The Grey Eagle drones are designed to carry Hellfire missiles and have reportedly been deployed in South Korea as war looms with the North after Kim Jong-un’s third missile test fire this month.

8 US Air Force is deploying a massive drone air armada to carry out strikes deep in North Korea territory Credit: Reuters

8 The Grey Eagle will be the mainstay of the drone force Credit: Alamy

8 President Donald Trump, pictured here at a Make America Great Again, has taken a hard-line with Kim Jong-un Credit: Getty Images

The deployment is part of a built up of military ordered by US President Donald Trump.

Already the US has deployed Terminal High Altitude Area Defence (THAAD) systems aimed at shooting down Kim Jong-un’s ballistic missiles.

And the USS Carl Vinson aircraft carrier group has now arrived in waters near the Korean peninsula yesterday, where it was joining the USS Michigan, a guided missile submarine that docked in South Korea on Tuesday.

State department spokesman Mark Toner said: “In addition to Thaad these [drones] are defensive measures that are a response to what we – and by ‘we’ I mean South Korea, the United States and Japan – view as a real and credible threat to our security.”

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Earlier this month, President Trump dropped the GBU-43 Massive Ordnance Air Blast (MOAB), dubbed the 'mother of all bombs', on an ISIS-infested cave in Afghanistan.

But it is speculated that the US Airfore may use a non-nuclear bomb which is BIGGER than the MOAB unleashed on ISIS to destroy Kim Jong-un’s underground nuclear sites.

The Massive Ordnance Penetrator, or MOP, is a “bunker busting” explosive and the largest non-nuclear bomb which the US has at its disposal.

8 The nuclear-powered submarine USS Michigan approaches to join the U.S. aircraft carrier USS Carl Vinson Credit: AP:Associated Press

8 USS Carl Vinson sailing towards the Korean coast yesterday Credit: Reuters

8 A mushroom cloud resulted from a devastating test of the MOAB prior to its use in Afghanistan Credit: GETTY

8 Test footage of the 15 tonne MOP bomb in action has never been made public

But US Pacific commander Admiral Harry Harris said so many bombs were being dropped that “we need more”.

He said: “Critical munitions shortfalls are my top war-fighting concern.

“We must maintain our capability to operate in contested environments.

“Additionally, we must continue to expand cross domain fires capabilities and focus on joint integration to strengthen deterrence and enable joint combined manoeuvre.

“Priorities include long-range and stand-off strike weapons, anti-ship weapons, advanced air to air munitions, theatre ballistic/cruise missile defence, torpedoes, naval mines, and a Cluster Munitions replacement.”

8 US Pacific Command Commander Adm. Harry Harris Jr. testifies on Capitol in Washington before a House Armed Services Committee hearing on North Korea Credit: AP:Associated Press

Trump has ditched the rule banning a drone strike outside of a war zone unless there was a “near certainty” of avoiding civilian deaths.

According to the Bureau of Investigative Journalism.up to 4,666 people — including 745 civilians — were killed by drone strikes in the Middle East and Afghanistan.

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