Seoul — North Korea’s Kim Jong-un awaits the winner of next week’s US presidential election armed with greater leverage in high-stakes nuclear diplomacy, thanks to a more powerful and versatile arsenal of weapons than at the start of the Trump presidency.

While Donald Trump boasts of having prevented war and exchanged “beautiful letters” with Kim, the US president has not wrested a single significant commitment from the North to roll back its weapons of mass destruction programme, according to Seoul officials and analysts...

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