Turkey, you dumb son of a...
Unfortunately on a legal stand-point we can't really kick Turkey out of NATO for this, but we can hang them out to dry in this case and let Russia know in an unofficial matter that we do not support Turkeys actions.
Sadly, I don't think anyone is majorly surprised by this, it was just a matter of time, considering how close to the Turkish border some of these missions have run, but even so it was stupid of Turkey to undertake this action, but we all know that Turkey are rooting for Daesh so that Assad can be removed and Syria remain disorganised, allowing Turkey to be the dominant power in the region.
It's a pity that Russia can't react in any manner other than diplomatically, if I were in Putins shoes I'd be sorely tempted to have one of the cruise missiles that they've been lobbing at Syria accidentally cross the border into Turkey and accidentally land on a SAM site, but that would just escalate the matter and that's an action that neither Russia or NATO want to happen, and it wouldn't be in Russias best interests now that it's winning over the West and the moderate Arab states into supporting its campaign in Syria (and even joining in in some places). So there'll be a lot of diplomatic furor, but chances are the military response will be minimal, most likely a few HARM equipped Flankers might roam the border, daring a Turkish SAM site to fire on them so they can respond and destroy it in self defence.