The Rus were a people, possibly Vikings living around Kiev having travelled the Dneipr River downstream from Belarus. The Dneipr was an historically important waterway for uniting Slavs and Kievian Rus leaders. Their tribal name became eponymous with their political area. Russia of course grew to include Eastern and Western Slavs and numerous other ethnic groups. Those that spoke the Rus language might be regarded as Russian in a sense. Rus’ people – Wikipedia
If Russia included the original territory somewhere between yet not exclusive of Sweden and modern day Ukraine one might say that no, Russia isn’t located entirely in Russia. Russia moved north and east for various reasons long ago and eventually a little bit south. The journey between the Baltic and Black seas was arduous and Ruthenia morphed somewhat.