>>17848783
>Anatolia
Are we still at this? There were many migrations along the Black Sea coastal region, starting in Suvorovo (before 4000 BC), and perhaps Suvorovo is linked to the Proto-Hittites.
Regarding the "Sredny Stog" haplogroup, it's interesting to read this in the article
>Malo1, Grave 5: R1ba1b2a2b1
>Malo2, Grave 14: R1b1a1b1b
Proto-Anatolians came from the Balkans, and these samples fit as a good candidate because there were kurgans found in Galatasary, dating from approximately the same time.
Feel free to think about which steppe could be the source.