Now that North Korean president Kim Jong Un has rejected Donald Trump’s offer to “go big” and agree to immediate, full denuclearisation, the US president has a choice to make: double down or embrace the art of the possible. Despite the overtures, Mr Kim remains convinced that nuclear weapons guarantee his security, stature and survival. Full denuclearisation remains an important aspiration, but the more practical challenge is to reduce nuclear danger now.

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This article was originally published in the Financial Times.