Story highlights Statement was written by Kim Jong Un, according to North Korean state media

US President Trump responded by calling Kim a "madman"

(CNN) North Korea could test a powerful nuclear weapon over the Pacific Ocean in response to US President Donald Trump's threats of military action, the country's foreign minister has warned.

Ri Yong Ho spoke to reporters in New York shortly after North Korean leader Kim Jong Un made an unprecedented televised statement, accusing Trump of being "mentally deranged."

The forceful rhetoric from Pyongyang came after Trump threatened to"totally destroy" North Korea in a speech to the UN General Assembly on Tuesday. Trump tweeted Friday that Kim was "obviously a madman" who would be "tested like never before."

In a rare direct statement delivered straight to camera, Kim said that Trump would "pay dearly" for the threats, and that North Korea "will consider with seriousness exercising of a corresponding, highest level of hard-line countermeasure in history."

"I am now thinking hard about what response he could have expected when he allowed such eccentric words to trip off his tongue," Kim said. "I will surely and definitely tame the mentally deranged US dotard with fire ."

Read More