That is exactly what I think. Turkey, and primarily the son of their President Erdogan, is making millions of off ISIS sold oil stolen from Iraq.
Russia is not only wiping Erdogan's ISIS allies off the map, he is cutting into Erdoagn's son's profits.
For Erdogan, this is Personal. For Vladimir, it is even more personal, because this has become a direct threat to his own power.
The world wails about blood diamonds, but ISIS oil is a yawn?
Of course Russia has its own pecuniary oil interests. I am not so sure it is upset over the ethics here. But anything is possible.