Trump's warning came as The Washington Post reported that North Korea had successfully produced a miniaturised nuclear warhead that could fit inside its missiles, according to a United States intelligence assessment.
"It is conceivable that North Korea's nuclear weapons programme has already considerably advanced and it is possible that North Korea has already achieved the miniaturisation of nuclear weapons and has acquired nuclear warheads", the Defence Ministry said.
The North Korean Hwasong-14/KN20 intercontinental ballistic missile fired last by North Korea could have the range to reach Washington, D.C., or New York City, according to thediplomat.com, while other sources estimated it could hit Chicago or Denver.
It comes as tensions between North Korea and the U.S. continue to increase, with Kim Jong-un threatening "thousands-fold" revenge against the USA after the United Nations passed a new set of stringent sanctions against the one-party state.
Though the US has major military bases much closer to North Korea, in both South Korea and Japan, Pyongyang said its focus is on Guam because the territory is home to USA strategic nuclear bombers.
Japan, a key USA ally, is also a potential target of North Korean aggression. Berger said that North Korea uses "illicit" networks to get supplies, and private sector companies can get around the restrictions.
President Donald Trump issued an apocalyptic warning to North Korea on Tuesday, saying it faces "fire and fury" over its missile program, hours after United States media reported Pyongyang has successfully miniaturized a nuclear warhead.
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Pyongyang "is ready to teach the US a severe lesson with its nuclear strategic force", sid Ri Yong Ho, North Korea's foreign minister.
His comments come following revelations that Pyongyang has successfully created a miniaturized nuclear weapon designed to fit inside its missiles.
Defense Intelligence Agency assessment first reported by the Post that found North Korea could have a reliable nuclear-capable ICBM as early as next year, two years earlier than previously estimated.
Intelligence analysts have been shocked by the fast development of North Korea's nuclear weapons program.
But the USA on Saturday achieved what appeared to be a remarkable diplomatic victory, securing the unanimous approval of tough new sanctions - including votes from Russian Federation and China.
The US military routinely discloses information about North Korean missile movements and launches.
Experts had until last month said it would take another two or three years for North Korea to develop a nuclear-tipped ICBM.
President Trump has Secretary of State Rex Tillerson talking with partners in Asia to help enforce the sanctions, hoping the loss of money will curb the communist country's nuclear ambitions. "We must be tough & decisive!"
USA president Donald Trump has threatened North Korea with "fire and fury" after several reports that the isolated regime may already have nuclear warheads. The United Nations also voted for steep sanctions against North Korea in light of recent aggressions.
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