I think it can be compared to e.g. The Irish learning Gaelic. It's part of the identity for some and spoken in the west of the island by a few. The government invests in keeping the heritage alive and you see it e.g. in how names are written. But many Irish don't speak a word of Gaelic without feeling less Irish as a result. Ukrainian is a bit like that except it's easier to learn if you already speak Russian.