A US strike group is moving towards North Korea as tensions mount over despot Kim Jong-un's nukes with Trump threatening to "act alone" against the secretive state.

The Navy force will move toward the western Pacific Ocean near the Korean peninsula, a US official told Reuters on Saturday.

8 US Carl Vinson supercarrier is being moves closer to North Korea as tensions between the nations mount Credit: EPA

8 North Korean leader Kim Jong-un watches the ground jet test of a high-thrust engine Credit: EPA

8 President Trump spoke to Chinese President Xi Jinping about North Korea Credit: AP:Associated Press

8

The moves comes as Kim Jong-un continues drive forward the nuke-mad state's advancing weapons program.

North Korea has carried out five nuclear tests - two of them last year - and expert satellite imagery analysis suggests it could well be preparing for a sixth.

Earlier this month North Korea tested a liquid-fueled Scud missile, which only travelled a fraction of its range.

The Carl Vinson strike group, which includes an aircraft carrier, will make its way from Singapore toward the Korean peninsula, according to the official, who spoke on condition of anonymity.

The official told Reuters: "We feel the increased presence is necessary."

Earlier this week President Trump threatened to “act alone” against North Korea as he met Chinese President Xi Jinping face-to-face for the first time in Florida.

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Trump’s top military advisers have reportedly told him assassinating North Korean dictator Kim Jong-un may be the only way to put an end to the country’s constant nuclear threats.

Other options include economic and military measures but lean more toward sanctions and increased pressure on Beijing to rein in its reclusive neighbour.

Pre-emptive military strikes on North Korea were not off the table, but the review prioritised less-risky steps.

Kim-Jong-un further fuelled tension between the nations as he branded US missile strikes on Syria an “unforgivable act of aggression” that defends its nukes.

Trump ordered the revenge hit against Syrian President Bashar al-Assad after dozens died in a suspected chemical gas attack in Idlib province.

Shocking pictures from the location of the attack included a sobbing father clinging on to the bodies of his dead children.

8 North Korean leader Kim Jong Un, center, reacts during the launch of four missiles in an undisclosed location Credit: AP:Associated Press

8 North Korea's repeated missile tests have been increasing tensions

8 President Donald Trump has ordered the strike force into the strategic position Credit: AP:Associated Press

8 President Trump can be seen being briefed by video link at his Mar-a-Lago resort with his secretary of state Rex Tillerson on his left ahead of strikes on Syria Credit: AP:Associated Press

Trump retaliated to the attack, which he described as “an affront to humanity” by launching strikes on a Syrian airbase with the US ambassador to the United Nations saying the country is “prepared to do more”.

Following US action KCNA news agency quoted an unnamed spokesman for the North Korean foreign ministry as saying: “The US missile attack against Syria is a clear and intolerable act of aggression against a sovereign state and we strongly condemn it.

“The reality of today shows that we must stand against power with power and it proves a million times over that our decision to strengthen our nuclear deterrence has been the right choice.”

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