OSCE sign at the entrance to the Hofburg Congress Center, Vienna, Austria, October 13, 2017. (USOSCE/Colin Peters)

OSCE sign at the entrance to the Hofburg Congress Center, Vienna, Austria, October 13, 2017. (USOSCE/Colin Peters)

OSCE sign at the entrance to the Hofburg Congress Center, Vienna, Austria, October 13, 2017. (USOSCE/Colin Peters)