North Korea's foreign minister lambasted US President Donald Trump on Saturday, saying he made its "rockets' visit to the entire US mainland inevitable" by calling leader Kim Jong-un "rocket man" and threatening to destroy the North.

In an address to the United Nations General Assembly, Ri Yong-ho said North Korea will take "merciless preventive action" if the US shows any sign of "decapitating operation on our headquarters or military attack against our country."

He called Trump a "mentally deranged person full of megalomania and complaisance."

 

"None other than Trump himself is on a suicide mission. In case innocent lives of the US are harmed because of this suicide attack, Trump will be held totally responsible."

In his address to the UN on Tuesday, Trump said the US will "totally destroy" North Korea if the US was forced to defend itself or its allies against a North Korean attack.

The North Korean leader responded saying Trump would "pay dearly" for the threat and Ri told reporters Friday that it could conduct the most powerful detonation of an H-bomb in the Pacific.

The top diplomat of Pyongyang rejected the latest UN.

sanctions over its sixth nuclear test as "unjustifiable."

Trump holding the nuclear button is the "gravest threat to international peace" and North Korea was left with no other choice but to respond with the "nuclear hammer of justice," he added.

"Through such a prolonged and arduous struggle, now we are finally only a few steps away from the final gate of completion of the state nuclear force," Ri said.

He said the North's ultimate goal is to establish the balance of power with the US. "Our national nuclear force is a war deterrent for putting an end to the nuclear threat of the US and for preventing its military invasion," he said. (Yonhap)