"One of the conflict's defining features has been the presence of foreign fighters. In December 2013, ICSR estimated that up to 11,000 fighters from 74 nations had gone to Syria –a greater number than in 'every other instance of foreign fighter mobilisation since the Afghanistan war in the 1980s.’ 3 While most of these fighters were thought to be from the Middle East, a significant minority –up to 2,800 –are European or Western."