To what populations they are closer to.
Heat maps.
Volga-Ural (Tatars, Udmurts, Chuvash)
https://i.postimg.cc/KzRkFrhM/volgaural.png
https://i.postimg.cc/gJnXdqbV/volgaural2.png
Central Asia (Kazakhs, Uzbeks, Kyrgyz)
https://i.postimg.cc/xCcJYyVb/central-asia2.png
https://i.postimg.cc/HxVcH418/central-asia.png
Caucasus (Circassians, Chechens, Georgians)
https://i.postimg.cc/PxPphznL/caucasus2.png
https://i.postimg.cc/LXnYRBFH/caucasus.png

