Saying that he will visit both Damascus and Tehran before the talks begin, de Mistura added that he would also meet with Turkish and Saudi authorities to reach a common understanding on political transition.
Syria has been locked in a vicious civil war since early 2011, when the Bashar Assad regime cracked down on pro-democracy protests with unexpected ferocity.
Since then, more than 250,000 people have been killed and more than 10 million displaced, according to the UN.
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