Hey, I'm doing my EPQ on Russian/Ukranian history but it's more so modern events.
The foreign language is a good question, but I believe the EPQ has to have more than 1 developed differing views maybe (don't quote me on this) so there probably isn't enough info for that as you've said.
The literature is a good aspect,especially since it links to your uni course and Russian degrees do focus on literature and history which Russia has a lot of.
You don't need to come up with a perfect title yet and get advice from your supervisors about the title and key areas to look at. The how literature changed after a certain event because people like Boris Pasternak were unable to publish their books in Russia is a good topic area.
All the best.
(Sorry if I don't make much sense either bit tired
)