<YONHAP PHOTO-0926> FILE - In this Tuesday, March 28, 2017, file photo, President Donald Trump listens during a meeting with the Fraternal Order of Police, in the Roosevelt Room of the White House in Washington. Trump says that the United States is prepared to act alone if China does not take a tougher stand against North Korea???s nuclear program. (AP Photo/Evan Vucci, File)/2017-04-03 06:12:09/<저작권자 ⓒ 1980-2017 ㈜연합뉴스. 무단 전재 재배포 금지.>

(FILES) This file photo taken on March 30, 2017 shows Chinese President Xi Jinping attending a welcome ceremony with Serbian President Tomislav Nikolic (not pictured) at the Great Hall of the People in Beijing. The first face-to-face meeting between Xi and Donald Trump at the US president‘s Mar-a-Lago resort in Florida will be a key test of whether the two leaders can overcome their vast differences and develop a personal bond. / AFP PHOTO / FRED DUFOUR <저작권자(c) 연합뉴스, 무단 전재