@Karpivna, I don’t know of an official U.S. census that takes into account specifically Russian Jews and Ukrainian Jews from the general populations especially if the Jews also declare as Russian/Ukrainian. It’s my understanding that most Jews in the U.S. declare as Jewish ethnicity regardless of what country their ancestry hails from. Though Jewish is technically a religious identity it also has elements concerned with race, culture, and ethnicity for Jews in particular. 

I live in PA currently and I can confirm that quite a large number of Ukrainians are present. Of Pittsburgh’s countless churches several are Ukrainian (including Orthodox, Roman Catholic, and Byzantine-East Catholic). Ukrainians are constantly throwing festivals and parties to which all are invited. The culture is alive and well here and as vibrant as Croats and Polish here.