There is also the Volhynia where many Germans settled in Russia.
https://www.wikitree.com/wiki/Space:Volhynia
Category: Volga German Project (wikitree.com)
Category: Black Sea German Colonies (wikitree.com)
Hi, if case you haven't seen this site for the village of Kamenka, births, marriages, deaths: Volga Parish Records (volgaparishes.com)