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The Marxist interpretation of imperialism says imperialism arises from the concentration of economic power in the hands of powerful monopolies and cartels within the capitalist nation which is pretty clear that it isn’t talking about monopolies on a global scale.

Being nationalist and deeply capitalist in an inwardly driven economy seems to fall squarely into the definition making Russia an imperialist state by the marxist definition.

Russia is inwardly driven, it is blocked from becoming an empire by NATO and the west. By being inwardly driven and "imperialist," by your claims, it would be imperializing itself.