He also criticized the US government's analysis of the 2013 Ghouta chemical attack in Syria, analysis by the US and other western governments of the April 4, 2017 Khan Shaykhun chemical attack, and accused the OPCW of "deception" concerning the Douma chemical attack. Earlier, he criticised US government statements about the reported success rates of Patriot missiles during the first Gulf War, also known as Operation Desert Storm.