Meanwhile, Moscow claimed victory in Mariupol after months of siege and the destruction of over 90% of the southern port city.
Some 700,000 Ukrainian soldiers are now actively participating in defending the country, Ukrainian President Volodymyr Zelenskyy said in a televised interview on Saturday.
In comparison, Russia deployed anywhere between 100,000 to 190,000 troops when it launched its invasion on 24 February, with the exact numbers of currently active units unclear.
Meanwhile, the Moscow forces continued their assault in the east after claiming victory in Mariupol on Friday as the last Ukrainian defenders holed up in Azovstal laid down their arms.
Read more about the day's developments in our live blog below.