To understand Turkey's almost hatred of the Kurds it's necessary to understand that the Kurds claim the southern, mountainous region of Turkey as a part of their homeland. That home also includes Northern Iraq and North Eastern Syria. In other words, they are in the middle of it. Here is a picture of their "homeland":
From their autonomous area in Northern Iraq the Kurds have moved west, and into Syria. Ostensibly they are fighting President Assad of Syria, along with several radical Islamist groups. In reality they engaged an overly ambitious ISIS army that attempted to conquer their Iraq territory - until the US air force put an end to it. Now the Kurds fight with those same ISIS formations to overthrow Assad. But is their goal to overthrow Assad, or is it more like carving North East Syria up, and adding it to their "historic homeland"? I suggest the latter to be true.
Turkey seems to understand this ambition extremely well. It has fought a decades old guerrilla-type war against the Kurds to keep its territory intact. Now, with the Kurds again working with the allies to topple another middle eastern head of state, Turkey has become very alarmed. So much so that today it released the following statement:
"The PYD (Kurds) has been getting closer with both the United States and Russia of late. We view the PYD as a terrorist group and we want all countries to consider the consequences of their cooperation."
In other words, the Kurds are an enemy of the state of Turkey, and cooperation/legitimization of their interests will be considered an act of war by Turkey. Now some may say that is reading into it too much, but consider the US response - the withdrawal of all Patriot missile systems from Turkey today. Those systems were meant to safeguard turkey from Syrian aircraft, but they also kept the peace (relatively) between Syria and Turkey during the 5 year old conflict. Now there is no such buffer. In another development today, it was reported Turkish forces, equipped with armor and bulldozers, entered Northern Syria. Right where the Kurds are. You get the idea. Turkey is putting its national interests first, which are defensive in nature, before those of its allies or adversaries - economic and otherwise.
Meanwhile, the Russians are faced with a predicament. On the one hand they have no beef with the Kurds, and perhaps even see the Kurds as being useful in the interim to fight other Islamic groups in Syria. Perhaps they have even done a quiet handshake deal with the Kurds to look after them with some territory in Syria if the Kurds play ball in saving Assad. That wouldn't be too surprising. The problem is that to keep that promise would mean going to war with Turkey - the 4th largest military in the world. All very complicated and messy. That means the Kurds become expendable at the right time, and there is all smiles around the table of great powers within the region.
That in a nutshell has been the nature of the Kurds dilemma for along time - too small a player swimming against a tide of geo-political interests that only match theirs on a temporary basis. Each time their young people lay down their lives in this or that conflict, with the ever lasting hope that a great power will deliver them their complete homeland as compensation, they get betrayed. The nature of the game known as Kurdish Roulette.
