My answer is "it doesn't matter at this point, in the context of larger issue of whether we have nation/country/culture/language based tags in the first place".
A bigger, strategic question is, Do we want to have a concept of tags that allow broad categorization of questions based on geographic/linguistic/national groupings.
If someone is interested in and specializes in "Russian literature" (however you define that, it's a legit specialization), will we as a community/site provide a way for that specialist to be able to easily find most "russian" - however you define that - questions, without having to subscribe to 50-100-500 individual tags for "russian" authors, which is what that person would have to do as of now (or simply be forced to scan 100% of site questions, which may be too much given the site size).
Please note that specifics of such tags (should they be based on geography? language? country? both?) is irrelevant to that large philosophical and strategic question of whether such tags as a concept have a place on the site. Yes, those specifics and differences change the exact set of questions for such tags by, say, 5% (Do Russian language works published in Israel count? Are USSR and Russian pre-USSR works same tag?). We can hash out and work through that 5% later, at our leisure, after we figure out whether we want to solve the first 95% of the problem first.
Please note that the above is 100% distinct from "country as a subject of work" discussion, which I will cover in a separate answer saying "no".