Free Syrian Army
In 2015, Russia joined the Syrian Civil War to help out the Syrian Armed Forces and Bashar Al-Assad. The Russian Intervention has "stopped the advance of the opposition," according to Al-Jazeera. While a new side joins in the war, the Syrian Democratic Forces, a group of Kurdish and Arab militias in northern Syria. The Russians "double tap" air strikes that killed civilians and humanitarian aid workers. The Syrian Defense Forces didn't exactly fight the Free Syrian Army, but relations are complicated, there were recorded fights between the two, but they mainly fought ISIS along eachother. The airstrikes have also targeted Free Syrian Army, killing at least 6,000 men.