Mr Trump commented on North Korea after he was asked about the U.S. military's decision to drop the largest non-nuclear weapon it has ever used in combat on an area of eastern Afghanistan.
South Korean officials said on Thursday there were no new signs to indicate a North Korean nuclear test was more likely, although they also said the North has maintained a state of readiness to conduct such a test at any time. "We will go to war if they choose", he said. "At a time and at a place where the headquarters deems necessary, it will take place".
On Saturday North Korea marks the "Day of the Sun", the 105th anniversary of the birth of state founder Kim Il Sung. The official added that if the USA shows any sign of "reckless" military aggression, Pyongyang is ready to launch a pre-emptive strike of its own.
North Korea's official KCNA news agency reported early on Thursday that Kim Jong Un had guided training of the army's special operation forces jumping from aircraft.
North Korea's official name is the Democratic People's Republic of Korea.
Trump also flexed his military muscle last week by ordering cruise missile strikes on a Syrian airbase the USA believed was the origin of a chemical weapons attack on civilians in a northern Syria town.
Trump has repeatedly said he will prevent Pyongyang from developing a nuclear-tipped ballistic missile capable of reaching the United States.
Many experts believe North Korea could have a viable nuclear warhead and a ballistic missile capable of hitting the USA mainland within the next few years.
The President made the comments after he was asked about the decision to drop the largest non-nuclear weapon in the USA arsenal on an area of eastern Afghanistan.
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Russian President Vladimir Putin denounced the strike as "act of aggression" and said it violated global law. It said Mr Lavrov and his U.S. counterpart agreed to continue discussions on Syria in person.
The ominous comments came the same day the USA military dropped the biggest non-nuclear bomb it possesses on Afghanistan, targeting a complex used by the Islamic State group.
Previously, the Democratic People's Republic of Korea (DPRK) threatened to reduce the United States "to ashes" if a preemptive strike is conducted.
The intelligence officials told NBC News that the USA has positioned two destroyers capable of shooting Tomahawk cruise missiles in the region, one just 300 miles from the North Korean nuclear test site.
Trump also flexed his military muscle last week by ordering cruise missile strikes on a Syrian airbase the U.S. believed was the origin of a chemical weapons attack on civilians in a northern Syria town. In February, China suspended imports of coal from North Korea - a key source of foreign currency for Kim Jong Un's hard-line Communist regime. Despite reports that Washington is considering military action if the North goes ahead with another nuclear test, Han did not rule out the possibility of a test in the near future.
"Whoever provokes the situation, whoever continues to make trouble in this place, they will have to assume historical responsibility", Wang said.
"Although the tension in the Korean Peninsula is pretty high, it's not high to the point of having an imminent war", Mr Gui said.
On Tuesday, North Korea warned of a nuclear attack on the United States at any sign of American aggression.
Update, 12:28 AM: Vice President Mike Pence is scheduled to arrive in South Korea on Sunday to celebrate Easter with US troops stationed there and meet up with South Korean officials on Monday, kicking off a ten-day trip through Asia, according to Reuters.
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