I don't know but have you seen most Russian women? If you tittie fuck them you don't have to look them right in the face. Here's another definition I found :
Russian Style
A very difficult sexual maneuver involving two people where one person lies on their stomach and the other places their penis inside the others mouth while shooting an AK-47 with the butt of the rifle in between the legs of the person lying down. It reduces recoil and produces good oral sex.
I asked a rundown girl that was greasing my pole if she did Russian and she said she didn't know what it was. When I explained I wanted to fuck her big tits she said she she.didn't do that and she emigrated to the US from Russia as a teenager and found that term.for tittay fucking offensive lol.