The Ukrainian armed forces say they have inflicted heavy losses on Russian troops since the beginning of the invasion.
Some 3,500 Russian soldiers had been killed and 200 others captured, the Ukrainian Defence Ministry said on Saturday morning.
In addition, 14 planes, eight helicopters and 102 tanks as well as more than 530 other military vehicles were destroyed.
The figures being put out by both warring sides could not be independently verified.
Heavy fighting is taking place in various parts of the country, the statement added, with Russian air attacks having taken place in the north-eastern city of Sumy, Mariupol in the south and Poltava in the east. Civilian targets were also hit in the capital Kiev, where street fighting broke out overnight.