"The Ukrainian army is quite rapidly and powerfully advancing in the south," Zelensky said in his daily address on social media, adding that "dozens of settlements" had been recaptured in the south and east.

Some of the territory was taken back in the regions of Kherson, Lugansk and Donetsk, he said, where referendums were held last week on being annexed by Russia.

Kyiv and the West have denounced the referendums as a sham.

Zelensky cited eight settlements in the southern Kherson region, where Moscow's forces have retreated in the face of a sweeping Ukrainian counter-offensive, according to maps presented by the Russian defence ministry on Tuesday.

The latest maps revealed by Moscow showed that Russian troops had left many areas in Kherson including along the west bank of the Dnieper River.

In the northeastern Kharkiv region, the mapping indicated that Russian forces had almost entirely abandoned the east bank of the Oskil River where they retained a foothold.

"Our soldiers do not stop. And it's only a matter of time before we expel the occupier from all of our land," Zelensky said.