"Two servicemen of the Armed Forces of Ukraine were killed and five were wounded," it said in an update on Facebook based on information from 00:00 to 18:00 local time on April 28.

The total number of attacks mounted by Russia's hybrid military forces on Ukrainian positions in the east of Ukraine on that day was 31 instances.

"Strongholds near the town of Krasnohorivka in the Mariupol sector came under fire from 120mm and 82mm mortars, Zu-23-2 anti-aircraft guns and grenade launchers of various systems. The enemy used guns of infantry fighting vehicles, anti-tank grenade launchers, heavy machine guns and small arms to shell the [Ukrainian] Marines stationed near the villages of Pavlopil and Vodiane. The Marines stationed near the village of Shyrokyne were attacked by infantry fighting vehicles and armored personnel carriers. Heavy machine guns were used to fire on the defenders of the village of Hnutove," the report said.

Read alsoOSCE reports increase in shelling in Donbas, militant tanks, GradsThe defenders of the town of Avdiyivka in the Donetsk sector came under fire from 120mm and 82mm mortars, grenade launchers of various systems and large-caliber machine guns. What is more, 120mm and 82mm mortars were used to shell ATO forces near the village of Luhanske. The enemy used anti-tank grenade launchers to attack Ukrainian troops near the village of Zaitseve, which was also under sniper fire.

The occupiers used banned 120mm mortars to shell Ukrainian positions near the village of Nyzhne in the Luhansk sector, while troops stationed near Novotoshkivka came under 82mm mortar fire, the ATO HQ said.

Read alsoAbout 1,500 Russian soldiers killed in Donbas since spring 2014: Russian NGO"The enemy was firing automatic grenade launchers on the defenders of the village of Krymske, while machine guns of large calibers were used against the defenders of Popasna," the report said.

"Commanders decided to fire back in some instances when there was a direct threat to the life and health of servicemen," the ATO HQ said.