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