Turkey, Jordan, Saudi Arabia, Qatar, none of them backs insurgents in Syria. Sure, there are volunteers from those countries, but they all use crappy outdated AK-47 rifles bought on the black market. They are not provided with efficient M16 rifles which is the standard rifle of those countries. On the other hand, Russia actively backs militants in Ukraine by providing them with the latest arms such as AK-74M rifles, RPG-26 bazookas, shoulder fired anti aircraft missiles. Heck, Iran provides NDF with Sayyad rifles and recon drones, which insurgents have no counterpart.
There are only a few thousand insurgents in Syria at any given time, too few to topple the government.
As for the international community, there are only 2 camps, the US camp and the China / Russia camp which is challenging the US camp. Everyone else is a none player.