Hi there,
In this challenge, using whatever PoD, have Russia (or an analogous state originating in the territory of European Russia, so not Poland-Lithuania or anything like that) encompass all the areas that are today Slavic states. It can have other territory too (Baltics, Hungary etc). Bonus points if such a state has no territory past the Urals. Extra bonus points if it includes the areas of Eastern Germany/Austria that were Slavic for a short period of time, and those areas having never been Germanised.