English: This map combines the three admxitures of Mongoloid origin, namely the Siberian, East Asian and Southeast Asian, which are the three principal components (in varying proportions) of Siberian tribes, Northeast Asian and Southeast Asian people. This East Eurasian admixture has been present in Europe and the Middle East at least since the Epipaleolithic, probably due to the nomadic nature of Siberian tribes and the absence of clear boundaries between Siberia, Europe, Central Asia and the Middle East. The Natufians of the southern Levant already possessed over 2% of East Eurasian, as did Early Neolithic Iranian farmers. Mesolithic Europeans had as little as 0.8% in the Balkans and 1.2% in Western Europe to 3% in Scandinavia and over 6% in Eastern Europe (Russia, Ukraine). Anatolian and European Neolithic farmers had very little East Eurasian ancestry, so the frequency dropped around Europe from about 5500 BCE until the arrival of the Proto-Indo-European speakers from the Pontic-Caspian Steppe descended from the Yamna culture (2.5% of East Eurasian) who spread west through the Corded Ware culture, Unetice culture and the Bell Beaker trade routes from Central Europe to Britain and Ireland, pushing back up the percentage of East Eurasian over 1%. Steppe nomads always carried substantial levels of Mongoloid ancestry. The Cimmerians had 14% of it, the Western Scythians (Ukraine) 7.5%, the Eastern Scythians (Urals, Kazakhstan) 33%, and the Sarmatians 10%. Later the Huns, Avars, Bulgars, Magyars, Mongols and Turks brought additional East Eurasian DNA into Eastern, Central and Southeast Europe and/or the Middle East.