Oh I applaud the Turks from a right to self defence point of view..this isn't the first incursion by the Rissians into Turkish airspace as you say.
But it yet again highlights the complexity of the official and unofficial allegiances in the area. Turkey being a Nato member is handcuffed to us and with us been supporting Assad opponents. They have also however been supporting IS rebels too. Russia no matter what they say is targeting anyone against assads regime. So we will have Russian, French, US, Saudi and if the UK joins in UK warplanes all in the same airspace all going for competing targets....disaster waiting to happen.
It's also interesting that we will have Cameron, Obama et al having to defend Turkeys action on the grounds of self defence when operating in Syrians airspace without invitation.....
Clusterfuck.