North Korean leader Kim Jong-un has pledged to denuclearise and meet U.S. officials after a historic meeting with President Xi Jinping.
The visit was Mr. Kim’s first known trip outside North Korea since he assumed power in 2011.
China has traditionally been secretive North Korea’s closest ally but ties have been frayed by its pursuit of nuclear weapons and China’s backing of tough UN sanctions in response.
Kim Jong-un's predecessors, grandfather Kim Il-sung and father Kim Jong-il, both promised not to pursue nuclear weapons but secretly maintained programmes to develop them, culminating in the North's first nuclear test in 2006 under Kim Jong-Il.