Historically, Lutheranism is Russia was mainly a ethnic German and Ingrian Finn religion, however, lately it has a number of followers from other ethnic groups as well-Komi, Mordvins even a few Russians and maybe Volga Tatars.
https://biblicalstudies.org.uk/pdf/rss/31-4_367.pdf
PS, sorry for my tagline.
Correct.
My great great Grandfather come from some of the Volga Lutherans.
In researching our tree, we found a few lost Finns still in Russia, and are (at least nominally) Lutheran.
I need to contact the someone in Mission Central about the current status of the mission in Russia. Last time, they said while there were typical government issues, they had a decent relationship with the local Orthodox. Granted, they make a real effort to not poach sheep from other shepherds.