Rus' is not unpopular among us since Rus' was the first Ukrainian state to exist, but Muscovites stole the term Rus' from us and use it as excuse for their imperialism by pretending that present-day Russia is the successor of the ancient Rus'. "Russia" has nothing to do with ancient Rus', in fact, Kievan duke Sviatoslav sold the ancestors of nowadays "Russians" as slaves :D

In fact, you don't know who is meant by the word "челядь" in the trade treaty with Byzantium. There might be your ancestors among those who knows?