U.S. President Donald Trump on Saturday welcomed the reemergence of North Korea's Kim Jong Un after weeks of speculation about his health, but prospects for the U.S. efforts to persuade Pyongyang to denuclearize appear as bleak as ever.

On Saturday, North Korean media said Kim cut a ribbon at a ceremony on Friday to mark the completion of a fertilizer plant.

It had not reported on Kim's whereabouts since he presided over a meeting on April 11, provoking speculation that he was seriously ill and raising concerns about instability in his nuclear-armed country that could affect other North Asian countries and the United States.