(CNN) US President Donald Trump and North Korean leader Kim Jong Un were planning to meet in Singapore on June 12, and, until just a few days ago, everything appeared to be on track.

Then the summit was off. Then it was on. Maybe.

Will it still happen? Who knows, but this should get you up to speed ... for now.

How did we get here?

Up until about two weeks ago, things seemed to be moving ahead as planned. The two sides had announced that the historic summit (a sitting US President has never met a North Korean leader) would take place June 12 in Singapore.

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