I still can't believe some of you lot are naive enough to think that ethnicity/religion/identity matters in geopolitics. It really doesn't.
I feel that some members on PDF are being way too emotional and not as pragmatic as they ought to be.
In the real world, ethnicity doesn't matter at all. Countries only care about their own interests. No country on earth truly cares about the interests of other countries. If you try to romanticize the real world, then you're only setting yourself up for huge disappointments.
The English and Germans are both Germanic-speaking peoples, and yet they despise each other and have fought each other on numerous occasions. The French, Italians, and Spanish are all Latin-speaking peoples, and yet they've fought one another many times in the past.
Omanis are an Arabic-speaking people, and yet they've had better ties with India and Iran than they've had with other Arabic-speaking countries.
Kyrgyzstan and Uzbekistan are both Turkic-speaking countries, and yet that didn't stop the Kyrgyz government from ethnically cleansing tens of thousands of ethnic Uzbeks over the last decade or so. Speaking of ethnic cleansings, the Turkic Uzbeks slaughtered and expelled roughly 20,000 Meskhetian Turks from their lands in the 1990s.
Like hell ethnicity matters in geopolitics. If it really mattered, then none of these atrocities would have been committed over the years.
As for Azerbaijan and Turkey, relations between these two countries deteriorated in the mid 1990s after the then Turkish government foolishly attempted to stage a coup against the Aliyev dynasty in order to annex Azerbaijan:
https://en.wikipedia.org/wiki/1995_Azerbaijani_coup_d'état_attempt
"According to a 1996 National Intelligence Organization (MİT) report, Turkish prime minister Tansu Çiller gave minister Ayvaz Gökdemir, police chief Mehmet Ağar, İbrahim Şahin, and Korkut Eken the green light to install Ebulfeyz Elçibey as president.[5][10] Elçibey was an ideological ally of Turkish Nationalist Movement Party (MHP) politician Alparslan Türkeş, who harbored aspirations of creating a Turkic state stretching across the Caucasus. Türkeş' support of the coup attempt also provoked a diplomatic crisis between Turkey and Azerbaijan, and the latter country officially requested a statement refuting the section of the report dealing with the attempted coup.[11]"
There's actually a very simple explanation as to why Turkey is trying to cozy up to Azerbaijan right now. It has more to do with energy than it has to do with ethnicity. Turkey is hungry for oil, and Azerbaijan is hungry for foreign investment.
That's the real nature of politics.
There's no Turkic brotherhood, just as there's no Arab or Muslim brotherhood either. The Safavid Turks and Ottoman Turks slaughtered each other for power.
Geopolitics is indifferent to people's identities.