“We know he has got nuclear weapons now, which makes him the most successful Kim because he has managed to attain a goal they were trying to achieve since the Sixties.
“They know nuclear weapons are the insurance policy that will keep the regime in power forever and he’s done it – but he won’t pull the trigger because it would end in the destruction of North Korea.”
Mr Mikul believes that if Kim Jong-un died without a clear successor then a “fight at the top” could cause “the system to break down”, leading to masses fleeing to China, South Korea and Russia.
He told Express.co.uk: “It’s probably better to have Kim Jong-un ruling, which is horrible to say but it appears that the economy is better under him than it has been, or at least as good as it’s ever been under any of the Kims.
“That said, we don’t know what is happening out in the countryside and how many people are still going hungry.”
Mr Mikul cast doubt on the belief that Kim Yo-jong, the ruler’s sister, could rise to power because of the “patriarchal” and “fairly sexist” society established by leadership.
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He argued that if she was “his brother” – rather than his sister – she would stand a greater chance of becoming the heir.
Kim Jong-un is believed to have three children, who could be in the running too, but it is not known whether they are male or female – nor how old they are.
The final outcome, if the dictator was to die, would be the collapse of the dictatorship and the end of the Kim dynasty – which to Mr Mikul could be a terrible disaster.
He predicts this eventuality is unlikely for now but that their rule has to end eventually and when it does it could be a “nightmare”.
Mr Mikul fears that mass suicides may happen after North Koreans realise they have been lied to by their leaders since its inception and they are made aware of reality outside their state.
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He told Express.co.uk: “Once this regime falls everything they have believed in since they were born will dissolve, it will be horrendous
“You have to want the regime to fall eventually but you also have to think about the psychological effect it will have on people there.
“Then the thought of unifying the two Koreas will be hard too, it was difficult enough unifying East and West Germany, there’s still this east and west divide there to this day.
“You have to want a terrible, brutal dictator’s regime to fall but there won’t be joy and liberation that comes when that happens, it will be horrible for a lot of North Koreans.
“In a similar way for example, imagine if something happened on earth that proved that Jesus never existed and there was definitive proof of that – imagine what would happen then.”