Slavs
Slavs can be further grouped by religion. Orthodox Christianity is practiced by the majority of Slavs. The Orthodox Slavs include the Belarusians, Bulgarians, Macedonians, Montenegrins, Russians, Serbs, and Ukrainians and are defined by Orthodox customs and Cyrillic script as well as their cultural connection to the Byzantine Empire (Serbs also use Latin script on equal terms). Their second most common religion is Roman Catholicism. The Catholic Slavs include Croats, Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks, Slovenes, and Sorbs and are defined by their Latinate influence and heritage and connection to Western Europe. There are also substantial Protestant and Lutheran minorities especially amongst the West Slavs, such as the historical Bohemian (Czech) Hussites.
Ukraine
In the 5th and 6th centuries, the Antes were located in the territory of what is now Ukraine. The Antes were the ancestors of Ukrainians: White Croats, Severians, Polans, Drevlyans, Dulebes, Ulichians, and Tiverians. Migrations from Ukraine throughout the Balkans established many Southern Slavic nations. Northern migrations, reaching almost to the Ilmen lakes, led to the emergence of the Ilmen Slavs, Krivichs, and Radimichs, the groups ancestral to the Russians. After an Avar raid in 602 and the collapse of the Antes Union, most of these peoples survived as separate tribes until the beginning of the second millennium.