Ivan Sirko (Ukrainian: Іван Дмитрович Сірко, tr. Ivan Dmytrovych Sirko, [ɪˈwɑn dmɪˈtrɔwɪt͡ʃ sɪrˈkɔ]; Polish: Iwan Sierko, [iˈvan sʲɛrˈkɔ]; Russian: Иван...