South Korea’s national security adviser on Monday thanked China for its “active support” in the diplomatic process that has set up a historic summit between leaders of the US and North Korea, AFP reported. Just days after he announced the planned meeting between Donald Trump and Kim Jong-un, Chung Eui-yong was in Beijing to brief China’s top diplomat Yang Jiechi on the fast-moving efforts to address the nuclear standoff. Trump and Kim have agreed to meet by the end of May, although a date and time have yet to be confirmed. Some in China are afraid the country, which hosted failed six-nation talks on the nuclear issue a decade ago, could be cut out of negotiations on denuclearizing the Korean Peninsula.