Later , Scythians admixed .
Later , Scythians were replaced by steppe nomads from the east coming out of the Xiongnu confederations of Mongolia and China , including the westward - expanding Huns ( fourth -- fifth century AD ) .
Later , Scythians admixed and were replaced by steppe nomads from the east coming out of the Xiongnu confederations of Mongolia and China , including the westward - expanding Huns ( fourth -- fifth century AD ) .