This article is a little dated (2/18/2016) for the fast moving events in this war-torn area of the world, but the author is highly qualified and offers another independent view of events.
As the Syrian army advances on Raqqa and seals off supply routes to the armed gangs inside Aleppo, no surprise that there is another spike in the propaganda war, this time directed against Russia.
Frustration and anger is driving Turkish cross-border shelling of Kurdish and Syrian army positions. Yet in many respects Turkey only has itself to blame.