Since his release into society last month following months of custody by South Korea's intelligence agency, Thae Yong-ho has conducted a series of media interviews in what he says is an attempt to reveal the truth about North Korea.
"Low-level dissent or criticism of the regime, until recently unthinkable, is becoming more frequent".
Thae Yong-ho, a former senior North Korean diplomat, speaks to a media conference in Seoul on Wednesday.
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Mr Thae told the BBC's Victoria Derbyshire Show he believed the North Korean leader "will press the button on these unsafe weapons when he thinks that his rule and his dynasty is threatened". "We have to spray gasoline on North Korea, and let the North Korean people set fire to it".
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North Korean diplomats are generally compelled to leave one of their children behind in Pyongyang when they are dispatched overseas, but Thae was able to take both his sons, now aged 19 and 26, to London - easing his preparations to defect.
Some tentative economic reforms have been put into effect in the North, but "those further down the food chain are finding life much tougher", Thae said.
He called for continued worldwide sanctions on Pyongyang and publicity campaigns to spread external information in the North and encourage its citizens into "popular uprisings". "And I think with that in mind he's going to turn the United States into North Korea 2.0".
The defector said he felt sure others would follow him as the country's elite "turned their backs" on Kim Jong-Un as the country was on a "downward path".
Thae is among the highest-ranking defectors from the North for years. It's a trap, Thae said, that would ultimately legitimize the North as a nuclear state, as has happened over time with India and Pakistan.