South Korea's national security adviser on Monday thanked Chinese President Xi Jinping for his "big role" in the diplomatic process that has set up a historic summit between Donald Trump and Kim Jong Un. Just days after he stood outside the White House and announced the planned meet between the US president and the North Korean leader, Chung Eui-yong was in Beijing to brief Xi and China's top diplomats on the fast-moving efforts to address the nuclear standoff. "The situation on the Korean peninsula has recently undergone very positive changes.



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