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In this June 12, 2018, photo, U.S. President Donald Trump reaches to shake hands with North Korea leader Kim Jong Un at the Capella resort on Sentosa Island in Singapore. With the next meeting between the two leaders set for Feb. 27-28 in Vietnam, there's hope and caution in South Korea on whether the leaders could agree to tangible steps toward reducing the North's nuclear threat after a year of soaring but fruitless talks. (AP Photo/Evan Vucci)