I'm also gonna revise Southern Ukraine/Crimea a bit. I have a Turkic Muslim state right there as of now (based off of the Crimean Khanate), but that was there largely off of being a protectorate of the Ottoman Empire, which never exists ITTL. As a result, I'm gonna move the Turkic Muslim state to the area between the Don/Volga rivers and the Caucasus Mountains, with Southern Ukraine being part of the Kiev-based Ukrainian/Ruthenian state and Crimea being part of the Byzantine Empire.Small Siberian-Russian states is genuinely a very novel idea. This TL might be a bit interesting.