Where is Russia? I mean Russian land of origin, your historical land?
Three possible answers. First - Kiev, Second - Novgorod. Third - all the areas in between.
Kiev is called the Mother of All Russian Cities. It's the historical center of gravity for the ancient state of Rus.
On the other hand you could argue that Novgorod is where it all started, because that is from where Oleg the Seer planned and executed his takeover of Kiev, which was the beginning of the creation of the Russian state.
Finally, both Kiev and Novgorod were in effect run by Vikings (Askold and Dir in Kiev, and Oleg, relative of Rurik in Novgorod). They were invited there to rule by the local population. So in this way you could argue that the origin territory is neither place, but everything in between these two points.
Unlike Ukrainians, Russians can trace the history of their leadership all the way back to Rurik. That is, there is an unbroken line of Novgorodian-Kievan-Vladimiran-Muscovite-Russian-Imperial-Soviet-RF leaders that you can trace from the 800s to the 21st century. When Ukrainians try to explain how it's actually them that are the custodians of Rus history, this is where things begin to break down for them. Every single one of their legendary leaders turns out to be a historic Russian statesman that considered himself Russian and never applied the word "Ukrainian" to himself.
At this point, many Ukrainians attempt to flip the script and say that they are the true Russians, and we are a mongrel finno-ugric race. Is this what you mean? That Ukrainians are the true Russians?