The Donetsk sector remains the hottest spot, the ATO press center said.

From evening to midnight, the militants were firing small arms on ATO forces on the villages of Pisky [near the ruined Donetsk airport] and Opytne. Enemy snipers were targeting at Ukrainian troops in Pisky and the town of Avdiyivka in the evening.

"The occupiers fired rocket-propelled grenades and heavy machine guns on the villages of Leninske and Zaitseve not far from the temporarily occupied town of Horlivka. Near the town of Svitlodarsk, they used heavy machine guns to shell the village of Luhanske," the report says.

After midnight, the ATO headquarters recorded four cases when Russian-backed militants had violated the ceasefire. All of them was the use of small arms near Pisky.

"The Ukrainian defenders did not respond to the aggressor's armed provocations," the press center said.