This photo combination shows some of the U.S. citizens who are in Russian custody. Clockwise from top left are Wall Street Journal reporter Evan Gershkovich, corporate security executive Paul Whelan, Army Staff Sgt. Gordon Black, a dual U.S.-Russian national Robert Woodland Romanov, Prague-based editor for the U.S. government-funded Radio Free Europe/Radio Liberty's Tatar-Bashkir service Alsu Kurmasheva, and a dual U.S.-Russian national Ksenia Karelina also known as Khavana. (AP Photo)