Slavs
Slavs are the largest ethno-linguistic group in Europe. Present-day Slavic people are classified into East Slavs (chiefly Belarusians, Russians, Rusyns, and Ukrainians), West Slavs (chiefly Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks and Sorbs), and South Slavs (chiefly Bosniaks, Bulgarians, Croats, Macedonians, Gorani, Pomaks, Montenegrins, Serbs and Slovenes).
Rusyns
Most of the predecessors of the Eastern Slavic inhabitants of present-day Western Ukraine, as well as of Western Belarus, referred to themselves as Ruthenians (Rusyns) (, transliteration "Rusyny") prior to the 19th century. Many of them became active participants in the creation of the Ukrainian nation and came to call themselves Ukrainians (Ukrainian: Українці, transliteration "Ukrayintsi"). There were, however, ethnic Rusyn enclaves, which were not a part of this movement: those living on the border of the same territory or in more isolated regions, such as the people from Carpathian Ruthenia, Poleshuks, or the Rusyns of Podlaskie. In the Soviet era, Boykos, Lemkos, Hutsuls, Rusyns, Ruski, Cossacks, Pinchuks, Polishchuks, and Lytvyns were classified as Ukrainian sub-groups.