Barnaby Joyce says Kim Jong Un would be insane to test a hydrogen bomb in Pacific.
Pyongyang's stated aim is to be able to target the United States mainland and the nation has flaunted the advances in its weapons programme in recent weeks, with the September test of what it said was a miniaturised H-bomb capable of being loaded onto a rocket.
A handful of North Korea analysts believe that this is the first time Kim Jong Un has ever released a first-person statement.
"They're testing a mechanism to incinerate human beings. give people disease from radiation, to partially burn human bodies".
However, speaking to the Reuters news agency, two senior South Korean diplomats expressed concern that Trump's rhetoric could provoke North Korea to launch an attack.
He blasted Trump's maiden speech to the UN General Assembly as "unprecedented, rude and nonsense".
North Korea responded to President Trump's latest "Rocket Man" jab and obliteration threats this week at the United Nations General Assembly by vowing to "surely and definitely tame the mentally deranged USA dotard with fire".
In his address to the United Nations on Tuesday, President Trump threatened to "totally destroy" North Korea.
"We must not sleepwalk our way into war", said Guterres at the annual summit of the United Nations General Assembly (UNGA) in NY.
He also insulted Kim by calling him a "rocket man" on a "suicide mission".
But Kim Jong-un's grip on authority is much weaker, so he HAS to show a strong response to Trump's comments.