Hali halisi katika historia hapakuwa nchi iliyoitwa "Kievan Rus". Jina hili lilibuniwa katika karne ya 19 tu; hata hivyo si kosa kulitumia ukijua si jina la kiasili.
There was Rus' in a narrow sence (Rus' proper): land near Kyiv, Chernihiv and Pereyaslav in nowadays Northern Ukraine, heartland of Rus - only those lands were named as Rus' in East Slavic chronicles. It is common to find in those chronicles that e.g. princes from Smolensk/Polotsk/Novgorod/Vladimir went to Rus' (in the meaning went to Kyiv) OR e.g. princes of Kyiv/Chernihiv/Pereyaslav returned to Rus' from their military expeditions in other parts of the country.
There was also Rus' in a wide sence: Slavic, Finnic and Baltic ethnic territories controlled by the country with the center in Kyiv. However Rus' name was used in a wide sence mostly by foreigners.
Nevertheless, Rus' unity was very short in time and soon it was dissolved into de-facto independent principalities that fought each other.
People, who lived in Kyiv, Chernihiv, Pereyaslav, Novhorod-Siversky, Halych, Volhynia and possibly Turov principalities were the direct ancestors of modern Ukrainians and have very distant relation to modern Russians. Ukrainians claim ONLY mentioned above principalities as the part of Ukrainian history.
At the same time all other principalities of Rus' (Polotsk, Smolensk, Pskov, Novgorod, Vladimir-Suzdal, Murom-Ryazan') have almost no relation to Ukrainian history: they are part of either Belarusian or Russian history.
The heartland of Russia was initially populated by Finnio-Ugric peasants of Merya, Meshchera and Muroma tribes and Slavic nobility who lived in cities-fortresses to control that wild forresty province. Later East Slavs from all parts of Rus' have been resettled to that land. So Moscowians was the mix of Kyivans, Novgorodians, Krivichs, Vyatichs, Merya and Meshchera. The fact that Kyivans took part in ethnogenesis of Moscowian nation does not give Russia the right to claim Kyiv and all Rus' as their towns and their hisrory. They already have their unique East Slavic nation in their ethnic borders. They should respect other East Slavic nations, their history and their right to be completely independent and not Russian vassals or satelites.