Monastyrska made her debut with the Ukraine National Opera as Tatiana in Tchaikovsky's Eugene Onegin in 1996 and became a principal soloist with the company in 1998. There, and at the Mikhailovsky Theatre in St. Petersburg, she sang the title roles of Verdi's Aida and Ponchielli's La Gioconda, as well as Amelia in Verdi's Un ballo in maschera, Lisa in Tchaikovsky's The Queen of Spades, Nedda in Leoncavallo's Pagliacci, and Santuzza in Mascagni's Cavalleria rusticana. In 2010 she appeared succes ...