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Slavo-Serbia/New Serbia
Slavo-Serbia(1753-1764) and New Serbia(1752-1764) were military frontiers in Russian Empire on territory of modern day Ukraine.
These frontiers were created with similar purpose like Military frontier in Austria. They were populated with Serbian settlers from Vojvodina and Slavonia.
Serbs founded many towns in these regions and often named them after their previous towns. Capital city of Slavo-Serbia was Bakhmut.
Being surrounded with Orthodox Slavic speaking people it didn't take long for Serbs to assimilate and today there is no Serbs left. But we still can see remainings of Serbs mostly in toponyms like for example city of Slovianoserbsk.
https://upload.wikimedia.org/wikiped...avo_serbia.png
https://upload.wikimedia.org/wikiped...serbia_map.png
https://upload.wikimedia.org/wikiped...serbia_map.png
Monument to Serbian,Russian and Ukrainian warrior in Slavianoserbsk
http://arhiva.alo.rs/resources/img/1...970-spomen.jpg
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This was part of creating Novorossiya (Southern and Eastern Ukraine). Tsarist Russia tried to populate the regions emptied after the expulsion of Tatars with other Eastern Europeans (including Romanians, Poles, Serbs etc). Since the tsarist invitation didn't result in many colonists settling in Ukraine, eventually the region was populated mostly with Russians and Ukrainians.