Russia-led forces mounted four attacks on the Ukrainian army's positions in Donbas, eastern Ukraine, on May 25.

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"There have been no Ukrainian army casualties. Information on the enemy's losses is being clarified," the press center of the Joint Forces Operation (JFO) said in an evening update on Saturday.

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All attacks were reported in the Skhid (East) sector, the report said.

In particular, Russian-occupation forces fired at Ukrainian strongholds near the village of Opytne, using 120mm and 82mm mortars. The enemy also opened fire three times from automatic grenade launchers and large-caliber machine guns outside the village of Pisky.

"To hostile provocations, Joint Forces units gave an adequate response. The situation in the area of the Joint Forces Operation remains under control of Ukrainian troops," the press center added.