Armed pro-Russia supporters walk outside the secret service building in the eastern Ukrainian city of Lugansk on April 13, 2014. Ukraine's interior minister said on April 13 that both sides had suffered casualties during a raid launched by Ukrainian special forces on a police station in the eastern city of Slavyansk that was seized by pro-Russian gunmen. AFP PHOTO / DIMITAR DILKOFF        (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)