This video brilliantly explains Syria's four-year civil war became so complicated, as we teeter on the edge of becoming militarily involved in it for the first time.
Taking us from the first protests against Assad's regime in early 2011, the Vox video explains how different factions emerged over time and the war evolved into a confrontation between regional powers as well as the US and Russia.
Next time someone argues for or against whether we should bomb Islamic State in Syria as if it's straight forward, suggest they watch this.
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This Video Brilliantly Explains How Syria's Civil War Became So Complicated