Firefighters extinguish a fire that erupted in a building following fierce fighting between Ukrainian troops and pro-Russian rebels in the southeastern Ukrainian city of Mariupol on May 9, 2014. Fierce fighting between Ukrainian troops and pro-Russian rebels broke out in Mariupol, killing at least 21 people, all but one of them insurgents, according to the interior minister. An attempt by around 60 rebels armed with automatic weapons to storm the police headquarters turned into a "full-scale military clash" when army and interior ministry troop reinforcements arrived, Arsen Avakov said on his official Facebook page. AFP PHOTO/ GENYA SAVILOV
Editor's Note: Ukraine celebrates Victory Day on May 9. The Ukrainian government warned that it expects violence backed by Russia to continue to destabilize the situation in Ukraine ahead of the May 25 presidential election.