U.N. security staff close a door at the start of a meeting between the HNC and UN mediator de Mistura...
U.N. security staff close a door at the start of a meeting between the High Negotiations Committee (HNC) and U.N. mediator Staffan de Mistura during Syria peace talks at the United Nations in Geneva, Switzerland, March 24, 2016. REUTERS/Fabrice Coffrini/Pool