Ex-U.S. Ambassador: No question now Hanoi summit outcome was 'bad news' for Kim Jong-un

President Trump and Kim Jong-un’s failure to reach an agreement in their second summit was “really bad news” for the North Korean leader, according to a former top State Department official who had a instrumental role in opening the current nuclear diplomacy with Pyongyang.

Mr. Trump’s decision at the Hanoi summit to reassert the U.S. position that “we cannot move on sanctions until there is much more progress on denuclearization” has altered the “power dynamics” going forward, says Ambassador Joseph Yun, who was U.S. special envoy on North Korea from...