There is no R1a in Kura-Araxes the PIE culture so people should start considering the language family they really spoke. Sredny Stog and R1a-M417 are strongly related to one group of people and it's not Indo-Europeans:
"The Sredny Stog culture carried a number of traits exclusive for the later Turkic peoples.
As far as the kurgans are concerned, only the Turkic peoples had retained a name for a man-made grave marker hill, and they bestowed that name "kurgan" on all surrounding IE and non-IE peoples, precisely because those people did not have a term for a foreign object belonging to a foreign religion from a contrasting culture.
The presumptuous militantly patriarchal nature of the Eneolithic burials is nearly identical to that of the Turkic kurgans in the historical times, which are known as being dual endogamic societies with no exaggerated sexual dominance, just to name the Dulo/Ukil ruling clans of the Hunno-Bulgars, or Ashina/Ashtak ruling clans of the Turks.
Animal bones are an intriguing accompaniment to many burials and the principal species represented were ovicaprids, cattle, horse, dog and some wild animals. These remains may often be interpreted simply as joints of meat presented as food offerings; however, other rituals were also at play. Frequently the skull and forelegs of a sheep, or much more rarely of a horse, are encountered in a grave and indicate the presence of a 'head and hooves' cult. In some cases the forepart of the animal might have been erected directly over the burial.
This prominent, radically distinctive, and without equal trait seems being directly taken directly from the textbook on Turkic burial traditions. Like the kurgan burials themselves, this religious rite survived and is well documented until the Middle Ages, and like the kurgan burials themselves, this religious rite was never as a traditional custom among Indo-European or Finno-Ugrian peoples."
Sort populations from central and north Asian by R1a and it's all Turkic groups at the top, from all over Eurasia. R1a is by far the most important Turkic Y-DNA.
https://en.wikipedia.org/wiki/Y-DNA_haplogroups_in_populations_of_Central_and_North_Asia
(Sort them by J and literally all IE groups go to the top.)
This guy here did a great work listing hundreds of placenames of Turkic origin in Corded Ware territory:
https://www.v-stetsyuk.name/en/Alterling/Bulgar.html
There is a lot of literature in Polish about the strong connection of Slavic and Altaic languages in case anyone is interested:
Theory of Asiatic origin of Slavs that was based among other things on many Altaic words in Slavic languages. Here is a short description of this theory (in Polish):
https://i.postimg.cc/tTTrjnp3/screenshot-447.png
The strong link Slavic languages have with Altaic languages was described by Kazimierz Moszyński in his book “Pierwotny zasięg języka prasłowiańskiego”:
http://www.worldcat.org/title/pierwotny-zasiag-jezyka-prasowianskiego/oclc/836127907