I know a lot of Ukrainians, and a few Russians.
Your assertion is flat false.
To the extent that there is any genetic difference between Russians and Ukrainians, it is the Ukies that have more Central Asian, Mongol and Tartar blood, not Russians. That's because Crimea was the HQ of the western Khanate of the Golden Horde, and later of the Tartar Khanate. It took Stalin to finally remove them back to Central Asia.
Moscow was founded by Slavs escaping the Mongols. Hell, Poland has more Central Asian descent than Western Russia.
And Chechens are more White than the gay jews killing every available Ukrainian.