Updated 11:57 a.m. ET Sunday Ukrainian President Oleksandr Turchynov promised in a televised address Sunday a “large-scale anti-terrorist operation” in order to prevent “the repetition of the Crimean scenario” following the death of a Ukrainian security officer during a shootout in the country’s eastern region. A Ukrainian security officer was killed and five others were wounded Sunday after special forces exchanged fire with a pro-Russia militia in an eastern Ukrainian city, Ukraine’s interior minister said.