North Korea is considering a hydrogen bomb test of unprecedented scale in the Pacific Ocean, the country's Foreign Minister announced on Friday.
Ri Yong Ho told reporters it could be "the most powerful detonation of an H-bomb in the Pacific," adding that he has no idea about what exact actions could be taken as it will be ordered by Kim Jong-un.
This announcement comes hours after the North Korean leader said US President Donald Trump would "pay dearly" for threatening to destroy the regime.
Foreign policy columnist Jeffrey Lewis says North Korea's actions are strikingly similar to that of China under Chairman Mao.
"I am often struck by how often contemporary DPRK rhetoric about nuclear weapons mirrors that of Mao's China," tweeted Mr Lewis. "The same themes recur."