white house admonish russia wednesday veto unite nations plan continue ongoing investigation recently find syria kill dozens people chemical weapons implore international body renew probe russia cast veto unite nations security council eight days ago prevent renewal mandate mission unite nations organization prohibition chemical weapons opcw know joint investigative mechanism jim investigate use chemical weapons syria russia attempt undermine eliminate jim show callous disregard suffer loss life cause use chemical weapons utter lack respect international norms white house say statement jim find syrian government bashar al-assad blame chemical attack opposition-held town khan sheikhoun kill dozens people last april accord report send unite nations security council last thursday unconscionable attack mark fourth time jim confirm assad regime use chemical weapons underscore brutal horrify barbarism bashar al-assad make protection provide russia even egregious white house say jim unanimously create 15-member u.n. security council 2015 renew 2016 another year mandate due expire mid-november unite state implore un security council renew mandate jim may continue identify perpetrators horrific attack send clear message use chemical weapons tolerate white house say 14th report since 2011 u.n. investigators say document 33 chemical weapons attack date twenty-seven government president bashar al-assad include seven march july 7. perpetrators identify yet six attack say assad government repeatedly deny use chemical weapons say strike khan sheikhoun hit weapons depot belong rebel force claim exclude u.n. commission inquiry syria chairman paulo pinheiro attack lead u.s. president donald trump launch first u.s. air strike syrian air base white house slam russia veto syria chemical weapons probe