Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
South Slavs
East:
The Serbo-Croatian varieties have strong structural unity, and are regarded by most linguists as constituting one language. Today, language secessionism has led to several standards: Serbian, Croatian, Bosnian and Montenegrin, although the latter has historically and traditionally been called Serbian and is still undergoing standardization. Bosnian was officially established in 1996. These Serbo-Croatian standards are all based on the Shtokavian dialect group. Other dialect groups, which have lower intelligibility with Shtokavian, are Chakavian in Dalmatia and Kajkavian in Croatia proper. The dominance of Shtokavian in the Western Balkans is due to historical westward migration during the Ottoman period. Slovene is grouped into South Slavic, but has many features shared with West Slavic languages. The Prekmurje Slovene and Kajkavian are especially close, and there is no clear delineation between them. In southeastern Serbia, dialects enter a transitional zone with Bulgarian and Macedonian, with features of both groups, and is commonly called Torlakian.