Actually in a way that “imperialism” was inherited after the fall of Golden Horde, in a legal/structural sense, and just continued by Slavic Russians. Nothing bad in it, i guess anyone would continue something like that if it had the power to do so. Thought i think originally Novogrod republic is the root of all Rus people (Russians, Ukrainians and Belorussians) while Moscow Imperialism is inherited from Golden Horde system, no offense meaning as talking about it in a system sense.