In this Feb. 11, 1986 file photo, unidentified people accused of spying for the West board a bus at the Glienicke bridge, after they were freed in an exchange of spies and prisoners between the East and West at the checkpoint between West Berlin and East Germany. Soviet Jewish dissident Anatoly B. Shcharansky was the first prisoner exchanged. (AP Photo/Heribert Proepper, File)
In this Feb. 11, 1986 file photo, Soviet Jewish dissident Anatoly B. Shcharansky, left, is escorted by U.S. Ambassador Richard Burt after Shcharansky crossed the border between East Germany and West Berlin at Glienicke Bridge during an East-West spy and prisoner exchange. (AP Photo/File)