Militants opened fire on Ukrainian army positions in Donbas 26 times over the past 24 hours, wounding four Ukrainian servicemen, the press center of the headquarters of anti-terrorist operation in eastern Ukraine said on its Facebook account.

According to the press center, militants fired grenade launchers and small arms several times at Ukrainian military positions in Novooleksandrivka, Novotoshkivske and Stanytsia Luhanska in the Luhansk sector.

In the Donetsk sector, grenade launchers and large-caliber machineguns were used against Ukrainian positions in Zaitseve and near the Butovka mine.

The Ukrainian armed forces returned heavy fire in response to most of these shelling attacks, the press center said.