[vik0]

It's not just a Russian name, it's the Slavic name for Constantinople. It's used in all Slavic-speaking countries when teaching Byzantine history, of course, written with slight distortions depending on the Slavic language in question

[sorokod]

The use of Byzantine seems to imply middle ages history. Do check out the Constantinople Agreement from 1915.

https://en.wikipedia.org/wiki/Constantinople_Agreement

[vik0]

Thanks, will do