A member of the Ukrainian armed forces is seen in the town of Maryinka
A member of the Ukrainian armed forces is seen in the town of Maryinka, eastern Ukraine, June 5, 2015. Ukraine's president told his military on Thursday to prepare for a possible "full-scale invasion" by Russia all along their joint border, a day after the worst fighting with Russian-backed separatists in months. REUTERS/Gleb Garanich