Honestly, almost as often it's Germany. As a German myself, I didn't really want to use Germany.
In my last long story, the evil power was Great Britain, who took over most of the world (helped by aliens). There were also hostile forces from South America. Russia wasn't even mentioned.
In "Stranded/Space War", my protagonist lands in the USA, which is the home country of the villain.
Luna 3 plays in space, no nationality attached.
In my short story "world war 3", one of the two characters carries a Hebrew name.
In all my stories, it's usually humanity as a whole, or a country - and this is the first time that I used Russia. So, I get your general frustration, but don't accuse me of being narrow-minded when this is the only story of mine you've read.
Thanks.