With North Korea, President Donald Trump puts on the charm. But with Iran, he cranks up the pressure with economic sanctions and a stronger military presence in the Persian Gulf

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Ken Christie, Head of the Human Security and Peacebuilding Program at Royal Roads University - Kim Jong Un has seemed as willing to meet with Trump as the U.S. president has been to talk and shake hands for the cameras with him. The North Korean leader jumped at the chance to meet Trump at the Demilitarized Zone between the Koreas last weekend.