In Syria's current war, who's Syria's allies and Syria's enemy?

The countries maintained relatively cordial relations during the Syrian Civil War. Syria and Iran are strategic allies. Syria is often called Iran's "closest ally", the Arab nationalism ideology of Syria's ruling Baath party notwithstanding.

The war, which began on 15 March with major unrest in Damascus and Aleppo, is being fought by several factions: the Syrian Armed Forces and its international allies, a loose alliance of mostly Sunni opposition rebel groups (including the Free Syrian Army), Salafi jihadist groups (including al-Nusra Front), the mixed