Turkey was a good ally, then they went full Islamofascist and no longer an ally of the West.
Russia is using Turkish airspace and Bosphorus straits to cement their presence in Syria.
Iran is doing what it wants in the Middle-East despite sanctions.
How you're going to meaningfully sanction Iran when the region's biggest economy (Turkey) is still doing business with them ?
The USA alligning with Israel, Saudi-Arabia, PKK didn't prevent any of that.
Everything the USA did in the last 16 years in the Middle-East was against Turkish interests.
Turkey borders Iran, Iraq, Syria.
All fucked up either by US war or US sanctions.
As a result: no significant trade, refugees etc.
What the gravest mistake was the USA allying with the PKK, training PKK, sending shitloads of weapons to PKK.
As a result Turkey began to work with Iran and Russia.
Now you pay a price.
All this sanction talk is bullshit, once the dust settles USA will work with Turkey.
If you don't Iran and Russia will increase their ifluence at the expense of USA, just like it is happening now in Syria.