The gunfire has been heard in several districts of the Ukrainian capital Kyiv through the night, the journalist of the Georgian Public Broadcaster (GPB) reported.
The Ukrainian armed forces say they neutralized subversive groups in the city.
Ukrainian authorities argue citizens to stay in homes or shelters.
More than 3.5 thousand Russian servicemen had been killed and nearly 200 captured, the adviser to the Ukrainian presidential office, Mykhailo Podolyak, reported.