President Biden's trip to Kyiv on Monday was shrouded in secrecy, a reflection of the steep security concerns of visiting an active war zone.
Air Force One departed Joint Base Andrews under cover of darkness at 4:15 a.m. ET on Sunday. Reporters aboard the plane were not allowed to carry their devices with them.
Biden's public schedule didn't reflect the trip, and White House officials repeatedly said last week that a visit to Ukraine was not in the works.
On Saturday evening, before he departed, Biden went out to dinner with his wife in Washington. He wasn't seen in public again until arriving in Kyiv on Monday morning.
Ukraine is an active war zone where the US military has no control, making Monday's visit different from previous presidential trips to Iraq or Afghanistan. White House officials had repeatedly ruled out a visit earlier in the year.
Biden is traveling with a relatively small entourage, including national security adviser Jake Sullivan, deputy chief of staff Jen O'Malley Dillon and personal aide Annie Tomasini.
President Zelensky first invited Biden to visit Kyiv a year ago, as Russian forces were massing on the border. As recently as last week, Zelensky said his invitation for Biden to visit Ukraine remained open, even as he acknowledged there were other means for them to speak.
Biden visited Ukraine six times as vice president. His last visit to Kyiv was in January 2017, days before leaving office. Before Monday, that visit remained the last highest-ranking visit to Ukraine, since neither Vice President Pence nor President Trump ever visited.