The clash between the Turkish Air Force and Russia is dangerous because it violates the first rule of proxy warfare which is principals don't fight principals. The whole point of proxy warfare is that only the seconds are allowed to cross swords. The duelists are forbidden from engaging each other directly, a convention intended to limit the scope of war.
Read the whole thing.
We mostly discuss international politics as though it were chess, when it really tends more toward of a mafia-driven, mezcal-drenched poker match with arbitrary players every hand.
The ME isn't really "sides" as much as it's a garbled graph problem. Every node is connected, more or less, to every other.
Thus, the principles chosen as a framework for how to react to the current crisis are the least squishy conversation one can have.