Oksana Samolyuk, Stepan Hlova and Valentyna Matsialko in a scene from “Natalka Poltavka.” CLEVELAND – The Maria Zankovetska Theater based in Lviv is one of Ukraine’s most distinguished and respected cultural institutions. Starting April 1 at the Ukrainian Catholic Seminary in Stamford, Conn., and ending April 10 at the Ukrainian Educational and Cultural Center in...