moscow russia defence ministry tuesday deny report two russian soldier capture syria russia interfax news agency report islamic state release video early tuesday say show two russian soldier say capture fight syrian city deir al-zor video release group amaq news agency two men appear wear gray tunics one wear handcuff appear bruise face one speak russian arabic subtitle video incidents involve capture losses among military servicemen russia arm force province deir al-zor areas syria interfax cite defense ministry official say russian military deny report capture russian soldier syria ifax