Two Ukrainian servicemen have been wounded over the past 24 hours as a result of attacks by militant groups in the Anti-Terrorism Operation (ATO) zone in eastern Ukraine, the Presidential Administration's military spokesman Andriy Lysenko has said.

"Over the past 24 hours two Ukrainian servicemen have been wounded in the area of industrial zone near Avdiyivka. No troops were killed," Lysenko said on Wednesday at a regularly scheduled briefing in Kyiv.

Lysenko said enemy forces continued shelling with the use of artillery systems under cover of darkness. Militant groups launched four artillery barrages near the villages of Stanytsia Luhanska, Sokilnyky and Novozvanivka in eastern Ukraine.

In the Donetsk sector, enemy activity was concentrated on the traditional "hotspots" in the villages of Luhanske and Zaitseve, and the town of Avdiyivka, Lysenko said. "Periodically, combined Russian-separatist forces used mortars. The enemy opened fire 16 times, using heavy weapons five times," he said.

In the area of the southeastern strategic port of Mariupol, enemy forces immediately after midnight unleashed a barrage near the town of Krasnohorivka.

"Using mortars and armored assault vehicles (BMPs), enemy forces continued firing for five hours, until dawn. What is more, Ukrainian troops successfully repelled an attack from illegally armed groups near the village of Novotroyitske. The battle lasted one hour. Ukrainian troops took out one BMP," Lysenko said.

He said militant groups were also active near the town of Mariynka, and the villages of Hranitne and Shyrokyne, and other locations.

"There were a total of 12 enemy artillery attacks and one skirmish in the Mariupol sector yesterday," Lysenko said.

He added that Ukrainian military intelligence during the last 24 hours reported ten enemy drone flights along the line of demarcation separating Ukrainian forces and militant groups.