President Donald Trump took to social media before meeting with South Korean President Lee Jae Myung on Monday to threaten not to do business with Seoul because of a “Purge or Revolution” that he claimed was taking place in the country.

But any prospect of a hostile Oval Office meeting evaporated after Mr. Lee heaped praise onto the U.S. president — lauding the decor, beseeching Trump to continue to help with Korean peace efforts and even suggesting a Trump Tower in North Korea.

“We've known each other and gotten along very well,” Trump said. After running down the agenda for the summit, Trump added: “It's a great honor to be with you and congratulations on your election. That was a big one, and we're with you 100%.”

The cordial display showed how world leaders are taking notes from pre

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