moscow russia send 175 de-mining engineer defuse mine syria deir al-zor interfax news agency quote russia defence ministry say monday first detachment 40 de-miners already deploy russia hmeimim air base syria ministry say syrian government force u.s.-backed militias converge islamic state separate offensives militants eastern syrian province deir al-zor sunday russia send 175 de-miners syria 's deir al-zor interfax