Slavic people are heritage of Scythians, Sarmatians, ARYANS.
One of more videos due DNA researches are most advance science at this moment and changes are often. I have done test and i will not write my result online...However, we have Proto-Indo-Europeans.
So called Scythians, Sarmatians etc is a code word for the Central-Asian Mongoloid invasion and the Slavic people have nothing to do with them genetically.