OSCE monitors reported a " rise in tensions " following New Year 's Day . Numerous ceasefire violations were recorded , with most occurring near Donetsk International Airport . Infighting amongst insurgent groups broke out in Luhansk Oblast . In one incident , LPR militants said that they had killed Alexander Bednov , the leader of the pro-Russian " Batman Battalion " , on 2 January 2015 . LPR officials said that Bednov had been running an " illegal prison " , and that he had engaged in torturing prisoners . In another incident , the leader of an Antratsyt-based Don Cossack militant group , Nikolai Kozitsyn , said that the territory controlled by his group , claimed by the Luhansk People 's Republic , had become part of the " Russian empire " , and that Russian president Vladimir Putin was its " emperor " . An intercity bus stopped at a government checkpoint in Buhas was hit by a Grad rocket on 13 January , killing 12 civilians . Ukrainian president Petro Poroshenko declared a day of national mourning . Buhas is south-west of Donetsk city
was hit
Volnovakha bus attack
War in Donbass