Further this incident gives Putin the possibility to start downing the French, German, Britain planes within Syria.
The only thing I anticipate 'The Allied Forces' to do is bomb the hell out of Assad's infrastructure and military facilities.
Just like what happened in Syria. 'The Allied' got permission to establish a no-fly zone and took the opportunity to destroy pretty much the whole irrigation system that Ghaddafi had installed.
The downing of the plane is a nice precedent making it easier to down NATO planes once they fly over Syria and bomb or supply the 'wrong' side.