South Ural and adjacent lands were a traditional Tatar area. Science tells that they are a Turkic people, belonging to the language family which emerged at the beginning of Common Era. Meanwhile Greek mythology knows them much longer.
The other group is represented by the Yenisseian language family which dwelled at the eastern shores of the West Siberian sea. This family is much more ancient and retained well known names such as Arins and Kets.
Ket people.
Hittites (Khets) created a famous empire on the territory of Asia Minor. Where did they come from? This event is encircled in mystery. The conquerors retained old names of the previous Hatti and even seemingly adopted their culture. How to explain such respect? Pronunciation of Hittites is similar to Kitai, the Russian name for China. Hatti is similar to Yeti. Were Yenissean Kets a very remote spawn of Hittite Empire or maybe both Hatti and Hittites came to Anatolia from South Siberia? The most probable variant is multiple shuttle migrations between these sites.
All these facts make it possible to formulate a hypothesis that what is known as Indoeuropeans was a group of modern humans led by remains of the previous hominids. They had 150 millennia longer human experience, were specifically adapted to northern climate and high mountains so were well suited to form a ruling class over the next generations.
Now let's look how this subgroup evolved further already as a part of Homo Sapiens. The first civilized communities separated into pastoralists and peasants which correspond to hunters and gatherers of Stone Age. Neanderthals were predominantly hunters so they should be linked to the later nomadic herders.