SLOVYANSK, Ukraine (AP) — Ukraine’s president Oleksandr Turchynov says the country is to launch a “large-scale anti-terrorist operation” to resist Russia’s aggression.

Turchynov said in a live televised address from the parliament that authorities in Kiev will not allow the “repetition of the Crimean scenario.”

A pro-Russian gunman stands guard at a seized police station in the eastern Ukrainian town of Slovyansk on Sunday, April 13, 2014. Ukrainian special forces exchanged gunfire with a pro-Russia militia in an eastern city Sunday, with at least one security officer killed and five others wounded. It was the first reported gunbattle in eastern Ukraine, where armed pro-Russia men have seized a number of government buildings in recent days. (AP Photo/Efrem Lukatsky)

A pro-Russian gunman stands guard at a seized police station in the eastern Ukrainian town of Slovyansk on Sunday, April 13, 2014. Ukrainian special forces exchanged gunfire with a pro-Russia militia in an eastern city Sunday, with at least one security officer killed and five others wounded. (AP Photo/Efrem Lukatsky)

Russia annexed the Crimean peninsula last month after local residents voted overwhelming to secede from Ukraine and seek to join Russia in a hastily called referendum.