Syrian Crisis have taken ugly turn due to jumping of Saudi Arabia and others against Soviets.
Raghubir Lal Anand has already advocated that basically this is a Shia-Sunni clash. They have to compromise with Asad Regime and solve the matter to establish peace for both sects.
Who is civilian and who is ISIS or Sunni-Shia is not clear. Turkey should respect the existence of Kurds who have also fought in Syria for legitimate right.
In case US also meddle it will be a way for third world war as Islam has various sects and all have to exist in Syria.