The Guardian | Julian Borger: Donald Trump�s approach to the world is little more than a tangle of personal interests, narcissism and Twitter outbursts

The new decade is about to start under many shadows, but none is more ominous than North Korea�s threat to return to nuclear and long-range missile tests after a two-year lull.

Pyongyang�s pendulum swing from enthusiastic summit diplomacy back to name-calling and threats comes as Donald Trump is increasingly focused on his re-election campaign.

That may be a good thing, as the US president will be wary of provoking a crisis to spoil his narrative of peace and prosperity.

Or it could be a very bad thing: Kim Jong-un could seek to exploit a moment of maximum leverage and miscalculate.

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