Rusyn is an East Slavic language spoken by the Rusyn people in parts of Central and Eastern Europe, and written in the Cyrillic script. Rusyns live in several different countries, including Poland, Hungary, Croatia, and Romania.
Rusyn is recognised as a minority language in most countries where it exists, but this sparked a linguistic controversy, as some linguists consider it a language and others a dialect of Ukrainian, with which it is largely mutually comprehensible, while others again consider it a variant of Russian.
One example among hundreds, if not thousands, of cases where the boundaries between dialects and languages are wafer-thin!
Photo Source: https://ie.pinterest.com/pin/336644140866057229/