Belarus–Ukraine relations
Belarus–Ukraine relations (, "Byelaruska-ŭkrainskiya adnosiny", , "Ukrains'ko-Bilorus'ki vidnosyny", , "Belorussko-ukrainskiye otnosheniya") are foreign relations between Belarus and Ukraine. Both countries were successively ruled by the Polish-Lithuanian Commonwealth, the Second Polish Republic, and ultimately, the Russian Empire. Prior to the 1991 breakup, both countries were part of the Soviet Union as the Belarusian SSR and Ukrainian SSR when they were the founding members of the United Nations in 1945. Being Slavic nations, both Belarus and Ukraine share closely related cultures and are predominantly inhabited by the East Slavic ethnic groups of Belarusians and Ukrainians respectively, along with a few Russians. Today, the two countries share an 891–km border.
North Slavs
North Slavic peoples today include the Belarusians, Czechs, Kashubians, Poles, Silesians, Rusyns, Russians, Slovaks, Sorbs, and Ukrainians. They inhabit a contiguous area in Central and Eastern Europe stretching from the north of the Baltic Sea to the Sudetes and the Carpathian Mountains in the south (historically also across the Eastern Alps into the Apennine peninsula and the Balkan peninsula); from the west in the Czech Republic to the east in the Russian Federation. There is also a significant share of North Slavic population in North Asia (Eastern Russia), and significant diaspora groups throughout the rest of the world.