WASHINGTON (Reuters) - The United States is  very disappointed  that Russia on Tuesday cast a veto at the United Nations Security Council against renewing a mandate to continue an investigation into who was responsible for the use of chemical weapons during Syria s civil war.   We are disappointed, we are very disappointed that Russia put what it considered to be political considerations over the Syrian people who were so brutally murdered,  State Department spokeswoman Heather Nauert told a regular briefing. 
U.S. condemns Russia veto of probe into Syria chemical weapons use