@Sviatogor Rusyn isn’t Ukranian, Rusyns I know in Serbia identify as Rusyns, not Ukranians. Rusyns in Slovakia I heard of rather identify as Slovaks than Ukranians. They will state that they have ties with Ukraine, they do use Zakarpatie Oblast’s coat of arms as national symbol, but they’re Rusyn. I’m saying all of this, because Rusyns lived throughout what was Hugary since mid 18th century, so you can’t be sure they migrated from south-eastern Ukraine anytime recent (19th-20th century being recent). All in all you’re right, if he’s Greek Catholic he’s most likely Rusyn. Of course, Ukrainians wouldn’t agree with anything I just wrote.