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.
Church Slavonic language
Church Slavonic, also known as Church Slavic, New Church Slavonic, or New Church Slavic, is the conservative Slavic liturgical language used by the Orthodox Church in Bulgaria, Poland, the Czech Republic and Slovakia, Russia, Belarus, Serbia, Montenegro, Bosnia and Herzegovina, the Republic of Macedonia, Ukraine, Slovenia, and Croatia. The language appears also in the services of the American Carpatho-Russian Orthodox Diocese and occasionally in the services of the Orthodox Church in America. It was also used by the Orthodox Churches in Romanian lands until the late 17th and early 18th centuries, as well as by Roman Catholic Croats in the Early Middle Ages.
It is also co-used by Greek Catholic Churches, which are under Roman communion, in Slavic countries, for example the Croatian, Slovak and Ruthenian Greek Catholics, as well as by the Roman Catholic Church (Croatian and Czech recensions, see below).