North Korea has threatened to send four Hwasong-12 ballistic missiles over Hiroshima, Shimane and Kochi to target Guam, a US Pacific territory.
The Asian country warned that it is preparing to fire four missiles over Japan and into the waters around Guam - where some 7,000 USA military personnel reside among the island's population of 160,000 American citizens.
On Friday, Trump tweeted that "Military solutions are now fully in place, locked and loaded, should North Korea act unwisely".
Carlin, as well as other North Korea experts on the call, agreed that North Korean leader Kim Jong Un would most likely decide against firing the missiles, as they're unreliable and present a large risk should they fail.
In the meantime, Prime Minister Malcolm Turnbull referring to the threat by North Korea to attack on Guam has promised Australia would come to the aid of the U.S. in the event of an attack on America soil. And at the southern end, there's the Naval Base Guam that hosts the Submarine Squadron Fifteen and the USS Frank Cable. After the attack, which North Korea has said it would take less than 18 minutes to reach the island, authorities advise Gambians to steer clear of areas marked "radiation hazard" or "HAZMAT" as well as all damaged areas.
In addition to the military presence, Guam also relies heavily on tourism to boost its economy, attracting more than 1.5 million visitors drawn to its pristine beaches and luxury resorts in 2016.
Media in South Korea have started floating the idea that the country may have to develop nuclear weapons of its own, as fears escalate of a potential conflict with North Korea.
Guam, an unincorporated US territory, is a strategic outpost about 2,100 miles south-east of Pyongyang.
When North Korea on Wednesday repeated its intention to plan a missile strike directed at Guam, its wording was filled with conditions and chances for the country to backpedal.
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Trump reciprocated the sentiment and suggested that the stalemate between the USA and North Korea could have had a different outcome, had he been the president in years past.
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The U.S. set up the Naval Station in Guam in 1899, designating the whole island as a base.
North Korean state media has reported that the country is considering plans to strike Guam this month.
The fourth C-130J Super Hercules arrived at Yokota Air Base, Japan, on Thursday, the US Air Force announced.
The U.S. -made Patriot batteries aren't the only pieces of high-tech American military gear in Japan that will have its ears perked up. Along with a bigger set of manoeuvrs held every spring, the exercises are routinely met by strong condemnation and threats of countermeasures from North Korea.
For decades, Guam has been a critical asset for the US military, housing 6,000 troops and strategic bombers capable of carrying nuclear weapons. Spain's colonial rule continued until the US took control in 1898 during the Spanish-American War. It has limited self-government, with a popularly elected governor, small legislature, and non-voting delegate in the U.S. House of Representatives.
But there's also some resentment about not being able to vote in the general election for US president.
It's not the first time North Korea has threatened Guam, which is a crucial, strategic hub for USA forces in the Pacific. The U.S. took back control of Guam on July 21, 1944.
Greg Kuntz, acting public affairs director for Joint Region Marianas, said the military on island continues to maintain standard operations amid threats from North Korea. Chamorros are the indigenous people of Guam.