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A POWERFUL US sub has arrived in South Korea amid worries of another North Korean missile or nuclear test as Kim Jong-un carries out huge war games.

The USS Michigan - capable of firing off salvos of Tomahawk cruise missiles - is to join the aircraft carrier USS Carl Vinson in drills near the Korean Peninsula.

 Nuclear-powered submarine USS Michigan arrives at the southeastern port city of Busan
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Nuclear-powered submarine USS Michigan arrives at the southeastern port city of BusanCredit: Reuters
 Tugs help push the USS Michigan along a quayside at Busan port as part of Washington's build up of forces ahead of a possible conflict
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Tugs help push the USS Michigan along a quayside at Busan port as part of Washington's build up of forces ahead of a possible conflictCredit: AP:Associated Press
 The USS Michigan is dedicated to firing cruise missiles and could be used to strike at North Korean test facilities or other high value targets
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The USS Michigan is dedicated to firing cruise missiles and could be used to strike at North Korean test facilities or other high value targetsCredit: Getty Images
 The exact length of the deployment to the region is unknown but the sub allows the US to target Kim Jong-un in much the same way as the recent attack on a Syrian airbase following allegations of a chemical attack
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The exact length of the deployment to the region is unknown but the sub allows the US to target Kim Jong-un in much the same way as the recent attack on a Syrian airbase following allegations of a chemical attackCredit: Reuters

The sub belongs to the Ohio class of boats which are the biggest of their kind ever to be built for the US Navy.

North Korea celebrates its army's 85th founding anniversary today and reports suggest it has marked the event with its "largest ever firing drill".

It is feared the anniversary will be marked with the testing of a nuclear device or a ballistic missile.

But instead North Korea deployed a large number of long-range artillery units in the region of Wonsan on its east coast for a live-fire drill, South Korea's military said.

North Korea has an air base here and missiles have also been tested there.

What kind of submarine is the USS Michigan?

The 560-foot-long, 18,000-ton Michigan is the biggest class of submarine in the US Navy and belongs to the Ohion class.

It began service as a ballistic missile submarine and loaded with nuclear missiles.

But during the 2000s it was converted to platform for conventional weapons and it’s firepower is awesome.

It can carry 154 Tomahawk cruise missiles at any one time.

Superior communications capabilities mean it can accurately hit its targets within minutes of being ordered to strike.

Sisters subs include USS Ohio, USS Florida and USS Georgia.

The boat will join the USS Carl Vinson Carrier Strike Group in the Sea of Japan amid fears war will break out between North and South Korea.

 An AWACS air surveillance plane lifts off from a runway in the southeastern port of Busan, South Korea, this morning on a mission
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An AWACS air surveillance plane lifts off from a runway in the southeastern port of Busan, South Korea, this morning on a missionCredit: EPA
 US Air Force's A-10 attack warplanes prepare to take off at Osan Air Base as war clouds gather
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US Air Force's A-10 attack warplanes prepare to take off at Osan Air Base as war clouds gatherCredit: AP:Associated Press

The South's Office of Joint Chiefs of Staff said in a statement: "North Korea is conducting a large-scale firing drill in Wonsan areas this afternoon."

The South Korean military was monitoring the situation and "firmly maintaining readiness", it said.

Meanwhile its navy said it was conducting a live-fire exercise with US destroyers today in waters west of the Korean peninsula and would soon join the carrier strike group approaching the region.

 A South Korean navy sailor watches the destroyer USS Wayne E. Meyer during a joint exercises between the United States and South Korea in South Korea's West Sea
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A South Korean navy sailor watches the destroyer USS Wayne E. Meyer during a joint exercises between the United States and South Korea in South Korea's West SeaCredit: AP:Associated Press
 A US Air Force U-2 spy plane flies over Osan Air Base in Pyeongtaek, South Korea,yesterday, to observe Northern Korean military activity
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A US Air Force U-2 spy plane flies over Osan Air Base in Pyeongtaek, South Korea,yesterday, to observe Northern Korean military activityCredit: AP:Associated Press
 US Army soldiers with M1A2 tanks prepare for war this morning (April 25) at the Mugeon-ri drill field in Paju, Gyeonggi-do, South Korea
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US Army soldiers with M1A2 tanks prepare for war this morning (April 25) at the Mugeon-ri drill field in Paju, Gyeonggi-do, South KoreaCredit: EPA

With tensions reaching boiling point, top envoys from South Korea, Japan and the United States met in Tokyo to discuss how to respond.

North Korea's growing nuclear and missile threat is perhaps the most serious security challenge confronting U.S. President Donald Trump.

Trump has vowed to prevent North Korea from being able to hit the United States with a nuclear missile and has said all options are on the table, including a military strike.

 Kim's missile range and the size of his armed forces
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Kim's missile range and the size of his armed forces


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