BEIJING/SEOUL: North Korean leader Kim Jong Un pledged his commitment to denuclearization and to meet U.S. officials, China said on Wednesday after his meeting with, who promised China would uphold friendship with its isolated neighbor. After two days of speculation, China and North Korea both confirmed that Kim had traveled to Beijing and met Xi during what China called an unofficial visit from Sunday to Wednesday. The visit was Kim’s first known trip outside North Korea since he assumed power in 2011 and is believed by analysts to serve as preparation for upcoming summits with South Korea and the United States. North Korea’s KCNA news agency made no mention of Kim’s pledge to denuclearize, or his anticipated meeting with U.S. President Donald Trump that is planned for some time in May. 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 U.N. sanctions in response. China’s Foreign Ministry cited Kim in a lengthy statement as telling Xi the situation on the Korean peninsula was starting to improve because North Korea had taken the initiative to ease tension and put forward proposals for talks.