In August 2017, Del Ponte resigned from the commission, due to frustration at the lack of support from the international community: “We could not obtain from the international community and the Security Council a resolution putting in place a tribunal, an ad hoc tribunal for all the crimes that are committed in Syria... Seven years of crime in Syria and total impunity. That is not acceptable.” She blamed Russia for vetoing action: "Now a prosecutor should continue our work and bring the war criminals before a special court. But that is exactly what Russia is blocking with its veto in the U.N. Security Council". She said that the commission has gathered enough evidence for president al-Assad to be convicted of war crimes. Del Ponte told Syria's ambassador that she had been right to quickly reach the conclusion that Assad's government used chemical weapons during an attack on the town of Khan Sheikhoun in April 2017.