Russia has vetoed a US-sponsored UN resolution that would extend the work of inspectors seeking to determine who is responsible for chemical weapons attacks in Syria. <br/><br/>The veto will prevent inspectors from doing their job and investigating chemical weapons attacks in Syria unless a new agreement is struck to extend them before mid-November. <br/><br/>The Joint Investigative Mechanism was set up in 2015 to identify perpetrators of chemical attacks on the town of Khan Sheikhoun in April. Russia had been pushing to postpone a vote on its extension but could not get enough support and used its veto to block adoption. <br/><br/>