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President Trump and North Korean leader Kim Jong Un both arrived in Singapore over the weekend, putting the world simply hours away from a summit that several months ago would have been considered highly unlikely.( Here’s a timeline .) This first-ever session between a sitting US President and a North Korean leader is likely to be a stunning contrast in styles : Trump’s freewheeling, go-by-the-gut tendencies versus Kim’s increasingly sophisticated geopolitical tactics. North Korean state media said the two will discuss denuclearization, but it’s unclear if the Northern korean and the US share the same definition for that term.