South Korea should start cooperating and doing more business with the other sanctioned countries

Welcome to the Trump’s list of bad countries, lets trade with each other.
We’re growing fast …

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I thought he’s a master deal maker?

Cede 1 acre of swampland between Crimea and the mainland, somewhere in the middle of it.

Don’t meet in the middle.
His middle is never in the middle of both sides.
He didn’t like NAFTA, he cancelled it and force Canada and Mexico to accept a better deal for him by putting tariffs.
Even his deal is not good enough, so he put tariffs again.
If you meet him in the middle, he’ll take more.
We have to make sure that everyone feels the maximum pain whenever he uses tariffs to force his will so he’ll learn that it’s not a good idea to bully other countries.