"Today, as a result of the shelling, one Ukrainian fighter was killed, while other two were injured," Chairman of Luhansk Regional Military and Civil Administration Yuriy Harbuz said.

Read alsoATO HQ: Militants attack Ukraine 35 times in last day, fire heavy artillery near Vodiane"Russian-backed mercenaries are constantly stirring up the situation on the demarcation line, thereby undermining Ukraine's efforts to de-escalate the conflict. The situation was most tense in late October, when the number of attacks rose to 20 per day," said the official. "The enemy began aimed shelling of civilian houses in the town of Popasna, and yesterday they actually fired on people who were standing in the queue at the Stanytsia Luhanska entry/exit checkpoint."