One Ukrainian military serviceman has been injured in the Kyiv government's military operation zone in eastern Ukraine in the past 24 hours, the Ukrainian presidential administration's spokesman Andriy Lysenko told reporters on Wednesday.

After sunset, militants shelled Ukrainian military positions "practically nonstop," using grenade launchers and large-caliber machineguns, Lysenko said.

"As a result of one such shell attack, one Ukrainian soldier was injured; there were no other casualties," he said.

The situation in Donbas is escalating, Lysenko said. "The enemy occasionally used mortar launchers, there was also a tank shell attack," he said, adding that the Ukrainian armed forces only fired "in response to most daring provocations."

On the Donetsk track, provocations took place along the entire frontline, the presidential administration official said. Near the village of Zaitseve, Ukrainian military positions were shelled with 82-milimeter mortars twice; militants also used mortar launchers near the village of Troitske, having launched 20 mortars there.

The hottest spot on this track was the area around Donetsk Airport where snipers also stepped up their work, with seven sniper attacks registered so far on Wednesday, the official said. Tank shells were fired near Pisky.

On the Mariupol track, the situation was unsettled near Maryinka and Krasnohorivka, Lysenko said. On the Luhansk track, there was no ceasefire breach.