There is "heavy fighting" in "almost the entire territory" of the southern Ukrainian region of Kherson occupied by Russian troops, Ukraine's presidency said Tuesday.

"Powerful explosions continued throughout the day and throughout the night in Kherson region," the president's office said in a morning update.

"Heavy fighting is taking place in almost the entire territory of the Kherson region. The Armed Forces of Ukraine launched offensive actions in various directions," it added.

The Russian side has not responded yet.