The US ambassador to the United Nations (UN), Nikki Haley, said: "We're not trying to pick a fight so don't try and give us one.”
Her comments come as highly skilled US marines and the carrier strike group USS Carl Vinson have also been deployed to Darwin, in northern Australia to beef up security in the Pacific region.
The US military with its ally South Korea have also been performing drills in the Korean peninsula.
The Trump administration has said all options are on the table for dealing with North Korea
North Korea has vowed it is prepared to go to war with the US if provoked and over the weekend unveiled a simulation of missile obliterating an unidentified city in the US.
North Korean vice foreign minster, Han Song-Ryol, also said the secretive state will continue to launch missile tests on a regular basis.
But the Pentagon are reportedly testing its ability to shoot down Kim’s missiles from the Vandenberg Air Force Base in California after the North Korean dictator unveiled what appeared to intercontinental ballistic missiles during a military parade over the weekend.
Going underground in one of North Korea's most secretive places
Tue, April 18, 2017
Welcome to the Pyongyang Metro, an astonishing 361ft station below street level, making it the deepest underground rail network on Earth
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Commuters leave a subway train platform of the Pyongyang metro
We're not trying to pick a fight so don't try and give us one
Nikki Haley, US ambassador to the UN
Pyongyang also displayed — for the first time — its KN-15, which is a land-based version of its deadly submarine-launched ballistic missile.
The missile, called the Pukguksong-2 or “Polaris-2”, is powered by solid fuel which according to military experts would give North Korea an edge in the event of nuclear war as it almost undetectable to US satellites.
Melissa Hanham, from James Martin Centre for Non-proliferation Studies, told the Washington Post: “Solid fuel is very significant because they can launch these missiles much faster and with a smaller entourage than with liquid-fuelled missiles, making them much harder for the United States, South Korea and Japan to spot from satellites.”
The US have been conducting military drills on the Korean peninsula
Inside North Korea: The pictures Kim Jong-un doesn't want you to see
Wed, April 12, 2017
Photographer Eric Lafforgue ventured to North Korea six times. Thanks to digital memory cards, he was able to save photos that was forbidden to take inside the segregated state
Eric Lafforgue/Exclusivepix Medi
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Taking pictures in the DMZ is easy, but if you come too close to the soldiers, they stop you
An advisor to the President Donald Trump, Lieutenant General HR McMaster, previously vowed “all our options are on the table” when dealing with the threat of North Korea.
Mr McMaster said: “All our options are on the table, undergoing refinement and further development.
“The President has made clear that he will not accept the United States and its allies and partners in the region being under threat from this hostile regime with nuclear weapons.”