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).
North Slavs
A 1922 article in "The Living Age" defined the term "Norths Slavs" differently: it featured a triple grouping where the South Slavic branch remains the same but the North Slavs include only the Czechs, Slovaks, and Poles; the Russians and Ukrainians instead were categorised separately as East Slavs according to this definition.