Major-General Adnan Sillu said he defected from the Syrian army three months ago after being party to top-levels talks about the use of chemical weapons on both rebel fighters and civilians.
"We were in a serious discussion about the use of chemical weapons, including how we would use them and in what areas," he told The Times, referring to a meeting held at Syria's chemical weapons centre south of Damascus.
"We discussed this as a last resort – such as if the regime lost control of an important area such as Aleppo."
Speaking from Turkey, General Sillu said he was certain President Bashar al-Assad's regime would eventually use chemical weapons against civilians, adding that the discussion had been "the last straw" which triggered his defection.
His comments come after German press reported on Tuesday that the Syrian army had tested a chemical weapons delivery system.
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