West Slavic languages
Both Pannonian Rusyn and Carpathian Rusyn are East Slavic languages. Pannonian Rusyn differs from Carpathian Rusyn in that the former has been influenced by the surrounding South Slavic languages (especially Serbian) whilst the latter has been influenced by the surrounding West Slavic languages (especially Polish and Slovak). Both forms of Rusyn are closely related to Russian Church Slavonic, Old Ruthenian and modern Russian.