Ukrainian servicemen of the Donbass volunteer battalion take part in clean-up operations in a village in the Lysychansk district of the Lugansk region, controlled by pro-Russian separatists on January 28, 2015. Ukraine's president appealed to Russia's Vladimir Putin and Washington threatened tougher measures should Moscow fail to rein in separatist fighters mounting a new offensive in the east of the ex-Soviet republic. AFP PHOTO/ ANATOLI BOIKO (Photo credit should read ANATOLII BOIKO/AFP/Getty Images)
