There was no "Roman power" in that areas. In the largest possible state of Roman Empire, it didn't really expanded further than south beach of Black Sea.

Roman Empire had too short hands for that regions, and never had any noticeable influence over them.

There was much more Greek cultural, linguistic, traditional, religious influence, not Roman.

The only trace of Roman Empire in that region could be Romania. At least, their language have Latin roots, but they are Orthodox Christians, and never was Catolics.

All that "tzar"/"caezar", "Moscow is a Third Rome, and there will never be Fourth one" and so on things have nothing to do with Roman Empire, it is all about Christianity, that in Orthodox tradition developed trough Ancient Rome (first Rome, lost its title after Catolic schism in 1054), Byzantium (Second Rome, lost its title after defeat from Ottoman Empire in 1453) and eventually Moscow took that title as an only Imperial ancestor of Orthodox Christianity.

There was no "Roman power" in that areas. In the largest possible state of Roman Empire, it didn't really expanded further than south beach of Black Sea.

Roman Empire had too short hands for that regions, and never had any noticeable influence over them.

There was much more Greek cultural, linguistic, traditional, religious influence, not Roman.

All that "tzar"/"caezar", "Moscow is a Third Rome, and there will never be Fourth one" and so on things have nothing to do with Roman Empire, it is all about Christianity, that in Orthodox tradition developed trough Ancient Rome (first Rome, lost its title after Catolic schism in 1054), Byzantium (Second Rome, lost its title after defeat from Ottoman Empire in 1453) and eventually Moscow took that title as an only Imperial ancestor of Orthodox Christianity.