There is evidence that this will worked for ransomware like Patya and for groups like Fancy Bear or Cozy Bear and Conti. Mostly because the Russia gov. unofficial guaranties immunity if the target is not Russian. Also, if you identify as Russian or write Russian in the chats or mails to them, they will de-crypt your systems for free.
It's not that simple, I think. There are many Russians everywhere, and probably they work at victim companies too, so just being Russian won't be enough, if ransom could be in the millions. You'll have to convince them that the company is Russian-owned, or that your father works in FSB, or whatever.
How would having one Russian in a company protect them from ransomware? There's no way to make that occurrence detectable to the malware.
Or, for that matter, why would ransomware care about the father of the computer owner?