Why relying on China to stop North Korea may not work

U.S. President Donald Trump, right, chats with Chinese President Xi Jinping during a welcome ceremony at the Great Hall of the People in Beijing, Thursday, Nov. 9, 2017. (AP Photo/Andy Wong)Children holding flowers and flags prepare for a welcome ceremony for visiting U.S. President Donald Trump outside the Great Hall of the People in Beijing, Thursday, Nov. 9, 2017. (AP Photo/Andy Wong)Attendees take photos during a business event which U.S. President Donald Trump and Chinese President Xi Jinpi