There's no way to defend Turkey's downing a Russian warplane on the Syrian border and machine gunning its parachuting crew...killing one (http://www.dailymail.co.uk/news/article-3333630/First-pictures-emerge-Russian-pilot-killed-Turkish-F-16-shot-jet-Syria-plus-pilot-survived-infantryman-killed-daring-rescue-mission.html)
If a Russian ally (say, Chechnia) had shot down an American warplane in that same region and shot at its parachuting crew, Americans would be demanding immediate and strong reprisals.
This ain't team sports.
What's RIGHT....is RIGHT and in this case, Turkey is clearly wrong.
There's no reason for the West (especially America) to back Turkey on this. In fact, we SHOULD BE forcing Turkey to apologize, condemn those actions and make the appropriate restitution for those rogue actions.
It seems that at every turn in this "War on Terror" the USA has done everything to scuttle a golden opportunity to find common ground with Russia over a common scourge.
G W Bush failed miserably and Barack Obama hasn't done much of anything to improve relations between two great powers that SHOULD be aligned against this common global problem (jihadist terrorism).
THIS is the kind of thing that makes such efforts much, MUCH less likely to succeed.