Svitlana Oleshko, the former artistic director of Kharkiv's Experimental Theater, in Warsaw, Poland, on Jan. 5.Anna Liminowicz/The Globe and Mail As one of Ukraine’s pre-eminent theatre directors, Svitlana Oleshko has explored just about every aspect of human emotion during her 30-year career. But ever since Russia’s invasion of her homeland last year, Oleshko has been contemplating one overwhelming sentiment: hatred. Oleshko, 49, was born and raised in Ukraine’s second-largest city, Kharkiv, where she founded the Arabesky Theatre in 1993. The Arabesky became one of the first avant-garde troupes in the country, winning acclaim for helping free Ukrainian theatre from its...