“Probably because Putin and Rouhani where in Turkey today having a confab with Erdogan.”
It’s not like the 3 of them together could stop us.
If we choose to do it, it’s done.
Nobody can project sufficient power into the theater to prevent us.
And neither Russia or Iran would war against the US to protect Turkey.
If Russia, Turkey & Iran decide that the US will leave Syria, we will have no choice. They are getting closer to making that decision.