Around 1000 AD Kieven Russ conquered the Khazars, which in turn unleashed the nomads they had been keeping in check.
By 1200s the Mongols arrived (usually called the Mongol-Tatars but there were no Tatars as Chengis Khan had exterminated that tribe 100 years earlier in pay back for the murder of his father). Anyways, the Kieven principalities were split up (the ones that weren't burnt to the ground) into individual states. When the Mongols pulled back from central Europe, western Kieven principalities, from Krakow to Smolnesk were gobbled up by Poland and Lithuania. Novograd managed to stay independent through 3 invasions by Lithuanians, Swedes and finally Teutonic Knights.
When Kiev was absorbed by Lithuania, the see of the Metropolitan moved to Moscowvy, which was a shock because Moscowvy, while an up and coming new power, had been considered a minor Kieven Russ principality and Vladimer or Novograd were the next two biggest after Kiev. Note Vladimer is well EAST of Moscowvy. Needless to say, the princes of Moscowvy continued to unify the other principalities (same thing that happened to the dozen different kingdoms of England and France and Spain and later in Germany to the three dozen principalities) until they took the name of Russia, derived from the Russ, under Peter the Great. Smolensk and Kiev were the ultimate prizes in reunification, but that didn't happen until the mid 17th centuary when Polish power was at last broken. Note that from 1200s to the mid 1600s, Poland had invaded Russia (Moscowvy) about a dozen or more times and actually conquered Moscow three times. Each time, peasant uprisings and popular armies had expelled them.
Why did I just give you this history lesson? To say, if you want to find Scythian blood, either look tot he Jewish Khazars or to Hungary or southern Germany where the Goths settled.
"To say, if you want to find Scythian blood,"
If I want to find blood in Ukraine, why go back to ancient history?
The Kremlin shed 15 million lives worth in just the past 80 years.