Ukrainian troops had to fire back to stop enemy shelling / Photo from UNIAN

One Ukrainian soldier was wounded in action, another three servicemen sustained combat-related injuries in Donbas, eastern Ukraine, in the past day.

"As a result of enemy shelling, one member of the Joint Forces was wounded, three sustained combat-related injuries," Ukraine's Joint Forces Operation (JFO) Headquarters said on Facebook in a morning update on May 11.

Read alsoUkrainian troops destroy enemy firing position in Donbas (Video)

On May 10, armed formations of the Russian Federation mounted 15 attacks on JFO positions in Ukraine's east, using proscribed weapons, namely 122mm artillery systems, 82mm and 120mm mortars.

In particular, Russia-controlled troops lobbed forty-one 82mm and 120mm mortar shells to attack Ukrainian units deployed outside the city of Avdiyivka, while fifty-four 82mm and 120mm mortar shells and twenty-five 122mm artillery projectiles were fired to attack JFO members near the village of Orikhove.

Other hot spots were the village of Starohnativka, where the enemy used armament of infantry fighting vehicles, and the village of Novotoshkivske, which saw three attacks with the use of 122 artillery systems, 82mm and 120mm mortars.

What is more, Russia-led formations opened fire from an anti-tank missile complex, grenade launchers of various systems, heavy machine guns, and rifles.

Ukraine's JFO units fired back, using available weapons. According to Ukrainian intelligence reports, five enemy troops were wounded on May 10.

From 00:00 to 07:00 Kyiv time on May 11, Russia-led forces were observing the ceasefire in Donbas.