ATO troops withheld 66 attacks by militants last day.
The most tens situation was observed near Luhanska.
"The tensest situation was observed near Luhanska, where Ukrainian positions came under heavy mortar and tank fire. The enemy also used heavy mortars to shell our troops outside Berezove," a 30 June report by the ATO press center reads.
In addition, militants fired at Ukrainian positions near Avdiyivka (18km north of Donetsk) and Butovka coal mine, using machine guns and automatic grenade launchers.
In Mariupol direction, terrorists used small arms and grenade launchers to shell Ukrainian strongholds near Shyrokyne, and Novotroitske.