Checkpoints of the Ukrainian Armed Forces in Donbas have come under fire 45 times in the past 24 hours, the press center of Kyiv's army operation in Ukraine's south-eastern regions. Grenade launchers and small arms were fired at Ukrainian military positions in Opytne, Avdiyivka, Luhanske, Troitske, Zaitseve, Mayorsk and at the Butivka mine, the press center said.Ukrainian fortifications in Pisky, Maryinka, Hnutove and Troitske came under mortar fire, it said.According to the press center's reports, 82mm mortars, an anti-aircraft system and infantry fighting vehicles, as well as grenade launchers, large-caliber submachine guns and small arms were used against Ukrainian army checkpoints near Krasnohorivka.