A street-sweeping truck operates outside the Sofitel Legend Metropole Hanoi hotel during the early morning in Hanoi, Vietnam, on Thursday, Feb. 28, 2019. Trump and Kim sounded an optimistic note at the start of their second set of face-to-face meetings, as the U.S. leader sought to advance nuclear talks that have largely stalled since their first summit in June. Photographer: Justin Chin/Bloomberg via Getty Images
