> bunch of celts > they probably germanize > slavs come in through maopolska, found a state > the germano-celtic abbos assymilate into the power structure. > later, some krauts come in, many die off or get booted, but a little mixing probably happens i would say they're 50/50, with slavic culture. ruskies are also largely finnic and deniper baltic and south slavs are partially actual roman settlers, part abbos etc not a lot of ancestries in europe, where culture and genetics line up. poland is one of the only big populations like that.
Poland