Photo from the Joint Forces Operation

Russia's hybrid military forces on Thursday mounted one attack on Ukrainian positions in Donbas, eastern Ukraine.

Read alsoTCG may hold video conference on Dec 20 to discuss prisoner swap – Kuchma

"The armed forces of the Russian Federation and its mercenaries violated the ceasefire once on December 19," the press center of Ukraine's Joint Forces Operation said in a Facebook update as of 07:00 Kyiv time on December 20, 2019.

The enemy opened fire from grenade launchers of various types, heavy machine guns, and small arms near the village of Troyitske.

There were no Ukrainian army casualties in the past day.

"Since Friday midnight, Russia-led forces have attacked Ukrainian positions near the villages of Nevelske and Slavne, using heavy machine guns and rifles," the update said.