After the United Nations speech in which Trump also said the USA would "totally destroy North Korea" in the event of an attack by the Asian country, North Korea's foreign minister appeared to liken Trump's speech to the sound of dogs barking.
In a rare statement by a leader of North Korea, Kim on Friday vowed to take countermeasures against the U.S. over Trump's threats regarding Pyongyang's nuclear and missile programmes.
An global lawyer believes US President Donald Trump has given over the real authority to the generals in the Pentagon, the Central Intelligence Agency and the neocons, who benefit from advocating a very belligerent stance not only against North Korea but also against China, Iran, Venezuela, Cuba and Russian Federation.
Chief Cabinet Secretary Yoshihide Suga said in a news conference on Friday: "North Korea's remarks and behaviour are provocative to regional and global security, and they are absolutely unacceptable".
"He's very risky", Kim Yeomyong said.More news: Odinga accused of fearing new presidential elections
The State Affairs Commission is the highest decision-making body of the North, introduced by the young leader in 2016 to replace the National Defense Commission, which his late father Kim Jong-il chaired to rule the country. The war of words between the adversaries comes as the North moves closer to perfecting a nuclear-tipped missile that could strike America.
The comments were released on official state media.
Describing the US president as "a rogue and a gangster fond of playing with fire", Kim said Trump was "unfit to hold the prerogative of supreme command of a country". North Korea has created problems with its allies.
A day earlier, Trump announced new sanctions on North Korea that aim to cut off sources of revenue for the regime's nuclear and missile programs. He also mocked Kim by calling him a "Rocket Man" on a suicide mission. In the statement, Kim also called Trump "a frightened dog" and a "gangster fond of playing with fire".
At first tweeting about Kim and his insults, Trump tweeted that Kim is "obviously a madman", since he "doesn't mind starving or killing his people".
The new measures would block any aircraft or ship from access to the United States for 180 days after its last visit to North Korea, and would also apply to any vessel involved in "ship-to-ship" transfers with North Korean vessels.