Mehrdad, I feel bad when I pass on A2As from you that I can’t answer. I can’t answer this either, but let’s analyse this.
Why was the EU formed? Really, for political reasons: with the hope that a closer financial, and then political union between France and Germany would prevent World War III. That agenda has in fact been embraced by a lot of people, who really do think of themselves now as European in Europe. It’s also been implemented very arrogantly, but that’s another discussion.
The exclusion of Turkey is probably a mistake, but if you’re going to build a United States of Europe, you do need a foundation of cultural commonality. I prefer to regard cultural commonality as a family resemblance kind of thing: the German and the Turk have nothing in common, but the Greek and the Turk have a lot more in common. But the deciding vote isn’t the Greek’s. (And the Greek’s vote for yes is not so much out of affection for the neighbour, as it is a “keep your enemies close” thing. Sorry.)
So. What about the Turkic Council that User-13062983365168259472 mentions?
It exists, but it is mainly cultural, it is not political or financial.
Culturally, Pan-Turkism is already a success; you don’t need a structure to teach people they are Turkic, the way the EU needed to teach people they are Europeans.
Politically? Erdoğan can influence Turkic nations without needing to resort to a formal arrangement; a formal arrangement would probably bind him into consensus too much, and make Turkey a primus inter pares, rather than what he’s likelier to prefer.
Economically? You’ve heard the arguments already: Turkey is doing very well, and the other Turkic nations would need Turkey more than Turkey needs them.
So I’m guessing that’s why.
But Mehrdad, I now have to ask you an indelicate question.
If there is a Turkic Union…
… what does Iranian Azerbaijan do? 🙂