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).
East Slavic languages
The East Slavic languages constitute one of three regional subgroups of Slavic languages, currently spoken throughout Eastern Europe, Northern Asia, and the Caucasus. It is the group with the largest numbers of speakers, far out-numbering the Western and Southern Slavic groups. The existing East Slavic languages are Belarusian, Russian and Ukrainian; Rusyn is considered to be either a separate language or a dialect of Ukrainian.