Armed pro-Russian militants stand guard at a check-point in the eastern Ukrainian city of Artemovsk on June 6, 2014. A Ukrainian police officer was killed and two others injured today when insurgents near the separatist stronghold of Slavyansk launched a mortar attack on a checkpoint, officials said. The insurgents, who had taken up position in a church, opened fire on Ukrainian forces, deputy interior minister Serhiy Yarovy said in a statement. AFP PHOTO / VIKTOR DRACHEV