Tannu Tuva was a de facto independent soviet republic which was eventually annexed and is now the modern Republic of Tuva
https://en.wikipedia.org/wiki/Tuvan_People%27s_Republic#History
I noticed but I didn't say anything because it wasn't a big deal (in my eyes at least)
Clarification: I assumed people would know it was a mistake and move on
Like the first 200 chapters (and maybe more or less) of this series was absolute fire, but it just kinda degraded over time... I wish the author didn't derail it every single arc
to be fair, isn't Mutsumi (I think that's her name, the Tanuki) underage? She in described, in chapter 57, as being 13 years old, so it'll be illegal to show naked kid.