Hi there again. I was looking at other message you have posted on ancestor who hanged the surname and came across this one. You forget about numerous migrations which happened within Russia and Europe. Russia is huge and includes many nationalities.
When you say Russian it could be from anywhere in Russia If you take the Russian from east and from west or north or south, they will all be different looking.
What are the origins of the surnames in your tree.? This might give you a clue as well.