Over the past day, Russian-backed militants opened provocative fire 14 times on the positions of Ukrainian soldiers in the area, press centre of the army operation headquarters reports. The attacks concentrated on the territory surrounding Donetsk, with traditional hotbeds, the villages of Pisky, Opytne and Krasnohorivka. The terrorists keep using anti-aircraft guns, mortars, large-calibre guns and small arms, according to the report. No Ukrainian servicemen were killed or injured in the area over past 24 hours, Presidential Administration spokesman on army operation Andriy Lysenko said at a briefing in Kyiv.