Think of it as England and Ireland. The Wikipedia category [0] is massive, but there's a difference between how the Irish and the English view their two nations. A modal Englishman could say, "the English, the Welsh, the Scottish and the Irish built the British Empire together, we should all be proud of what we did", but a modal Irishman would reply, "no, thanks, we didn't need your empire and we don't need your patronizing fraternization". The fact that both of them have a grandparent from Derry and a grandparent from Norfolk wouldn't matter at all.

Ukraine is currently undergoing the same kind of national divorce. Ukrainian roots don't matter, what matters is that one supports the idea of Ukraine being a distinct nation with its own way.

[0]: https://en.wikipedia.org/wiki/Category:English_people_of_Iri...