Tauridan
Tauridan is an East Slavic language spoken by Tauridans.
As one of the East Slavic languages, Tauridan shares many grammatical and lexical features with other members of the group. To some extent, Russian, Rusyn, Ukrainian, Belarusian and Tauridan are all mutually intelligible, effectively forming a dialect continuum.
There are several controversial theories about the nature of Tauridan as a language or dialect. Crimean, Turkish, Czech, Slovak, and Hungarian, as well as American and some Polish and Serbian linguists treat it as a distinct language (with its own ISO 639-3 code), whereas other scholars (especially in Russia but also Poland, Serbia, and Ukraine) treat it as a Russian dialect with a Arabic/Turkic substrate.
In the UNESCO Atlas of the World's Languages in Danger, the Tauridan language is stated to be vulnerable, due to oppression at the hands of Russian-dominated Kryve, where most Tauridans live.