Like many pieces of history right now, there’s a deep divide over who it truly “belongs to”. The Kievan Rus are claimed as foundational nations by Ukraine, Belarus, and Russia, and is part of competing narratives over Ukraine and an independant nation vs. a “brotherly nation”/subset of Russia, as the Kievan Rus were based in Kyiv, and originated Russian royal families. However, the Kievan Rus’ foundational dynasty were originally Varangian – Swedish vikings that had traded, raided, and settled down the rivers into Eastern Europe, and they largely held a loose confederation of land, not a single unified empire.
One of the best stories of the Kievan Rus is the tale of St. Olga of Kyiv – a woman who was probably sainted to stop her from murdering more people (this actually happened a lot in the late viking era). Her story is likely largely embellished in the historical record, but boy it is a hell of a tale. This is where the reference of “sending pigeons” from Ukrainian stand-up comes from – to destroy an enemy city by requesting a bird from the rafters of each house of the city as her wedding gift, then tying burning cloth to all the birds and letting them fly back to the thatched roofs. The whole great gory story is here, worthy of an action movie: