2013 : After the alleged chemical weapons attack in the Ghouta area of Damascus , the UN sent an inspection team to begin an investigation . The final report concluded that evidence suggests that " surface-to-surface rockets containing the nerve agent sarin were used in Ein Tarma , Moadamiyah and Zamalka " . The Russian government dismissed the initial UN report after it was released , calling it " one-sided " and " distorted "
chemical weapons attack
Ghouta chemical attack
Siege of Eastern Ghouta