Donald Trump’s face-to-face with Kim Jong Un will mark a historic milestone in relations between Washington and Pyongyang - and cap a stunning about-face for the mercurial leaders who months ago were trading threats and insults.
Here is a look back at the 18-month diplomatic roller-coaster that took Trump and Kim from rhetorical warfare to the verge of the first summit between a sitting US president and a North Korean leader, set for June 12 in Singapore.