What mentality went into deciding the various national republics in the USSR? Or, why did the Ukrainians, Kazakhs, or Uzbeks get Soviet Socialist Republics that later became independent, but the Chechens, Buryats, or Yakuts didn't?
I've touched on this in a previous answer, but if you have anything else you'd like to ask please feel free to ask a follow up. I'm happy to get into it more.