FILE PHOTO: A policeman stands guard in front of the Turkish embassy during a protest in reaction after a Russian war plane was shot down by Turkey, in Moscow, Russia, November 24, 2015. REUTERS/Maxim Shemetov/File Photo
FILE PHOTO: A policeman stands guard in front of the Turkish embassy during a protest in reaction after a Russian war plane was shot down by Turkey, in Moscow, Russia, November 24, 2015. REUTERS/Maxim Shemetov/File Photo