hague block u.n. security council action syria russia propose change rule inspectors world chemical weapons body hague move western diplomats experts say would undermine work late confrontation russia close ally military backer syrian president bashar al-assad west international inquiry establish determine behind ongoing chemical attack syria civil war come russian president vladimir putin host assad late monday talk aim end conflict rag nearly seven years l8n1nr3vo organisation prohibition chemical weapons opcw draft russian-iranian decision circulate among 41 members body executive council copy obtain reuters seek overturn procedures opcw inspectors work find share proposal discuss opcw decision-making executive council meet tuesday little chance obtain sufficient support pass russia ambassador opcw alexander shulgin say interview moscow remain commit opcw efforts prosecute perpetrators attack russia convince find implicate syrian government say defend effort change mandate also question decision send opcw inspectors khan sheikhoun nearly 100 people kill sarin april base pretext security condition head opcw say time team deploy khan sheikhoun due genuine security risk ambush shoot investigations 2013 2014. team confirm sarin poison test blood victims across border turkey russian draft say opcw withhold find base result on-site investigations experts say attempt scupper investigations russia supreme goal compromise ability opcw fact-finding mission job professionally without political interference say gregory koblentz non-proliferation expert george mason university u.s. state virginia draft resolution see part russian strategy undermine international investigations use chemical weapons syrian government say last friday moscow block proposal extend mandate joint investigation unite nations opcw say seriously flaw 2013 u.s.-russian deal assad agree hand toxic stockpile follow sarin attack damascus suburb dozens countries help remove destroy lethal chemicals attack continue investigators already conclude syrian government force behind late attack nerve-agent sarin chlorine barrel bomb islamic state militants use sulfur mustard gas syria deny use chemical weapons sweden uruguay push u.n. security council revive international inquiry without support russia hold veto u.n.-backed inquiries u.n. veto russia move chemical weapons watchdog