Russia’s involvement with foreign assets is pretty well-documented. Maybe not on a hysterical level where someone believes Russian government stole elections in USA, but they definitely meddled and continue to meddle in affairs of neighbouring countries and EU, both through information campaigns and via direct actions and influence.

Talking about stuff from early Middle Ages (князи), it has zero relevance to modern culture. Russia is anything but isolationist as it should be clear since 2014/2022.