unite nations russia cast veto unite nations security council tuesday prevent renewal mandate mission investigate use chemical weapons syria investigation unite nations organization prohibition chemical weapons opcw know joint investigative mechanism jim unanimously create 15-member u.n. security council 2015 renew 2016 another year mandate due expire mid-november jim due report oct. 26 responsible attack april town khan sheikhoun hold opposition syrian president bashar al-assad kill dozens people russia want discuss report vote extension mandate u.n. ambassador vassily nebenzia unsuccessfully ask postpone vote try create impression jim dead letter unless adopt resolution today nebenzia say prior vote ready return extend jim publication report discuss 26 october separate opcw fact-finding mission determine june ban nerve agent sarin use khan sheikhoun attack prompt unite state launch missiles syrian air base russia demonstrate whatever take ensure barbaric assad regime never face consequences continue use chemicals weapons u.s. ambassador unite nations nikki haley travel africa say statement vote nebenzia say elimination chemical weapons syria nearly finish recent report late last month opcw say verify destruction 25 27 chemical weapons production facilities declare syria continue prepare inspection confirm current condition last two china abstain tuesday vote bolivia join russia vote eleven countries vote favor text russia veto extension mission probe chemical weapons use syria