“In such context [of government’s army success] would it be logical for us to use chemical weapons,” Muallem said.
Moreover, the first reports of the chemical attack in the province of Idlib appeared a few hours before the Syrian Air Forces conducted an airstrike on an al-Nusra Front ammunition depot on April 4, Walid Muallem noted.
"The chemical attack in Khan Shaykhun was reported at 06:00 am, while the first airstrike by the Syrian army on an ammunition depot of al-Nusra terrorists with chemical weapons inside it was carried out at 11:00 am," Muallem said.
Following a 2013 chemical weapon attack in Syria's East Ghouta, Syria joined the Convention on the Prohibition of Chemical Weapons. This was the result of an agreement between Russia and the United States on the destruction of chemical weapons in the Arab country under the control of the Organisation for the Prohibition of Chemical Weapons (OPCW). In January 2016, the OPCW announced that all chemical weapons in Syria had been destroyed.