Both Ukraine and Russia say civilian evacuations from the besieged Azovstal steel plant in Mariupol were completed on Saturday -- the last day of a three-day ceasefire announced by Russia.

Ukrainian President Volodymyr Zelenskyy said in his latest video address that more than 300 civilians have been rescued. He added that Ukraine is also working on humanitarian corridors for all residents of the city and surrounding settlements.

Earlier, Ukrainian Deputy Prime Minister Iryna Vereshchuk commented on social media that the president's order had been carried out, and that all women, children, and elderly civilians had been evacuated from the steel mill.

She added that this part of the Mariupol humanitarian operation is over.

Russia's defense ministry also said in a statement that a humanitarian operation to evacuate civilians from the compound had been completed.

But Ukrainian forces are believed to be still holding out at the steelworks against a Russian siege.

Russia appears to be trying to take full control of Mariupol before Monday's Victory Day holiday commemorating the former Soviet Union's World War Two victory over Nazi Germany.

Russian forces are expected to intensify their attacks on the steel plant. Ukrainian officials say Russians have stormed into the compound.

Meanwhile, Russia's defense ministry announced on Saturday that its troops destroyed an arms depot near a railway station in the eastern Ukrainian region of Kharkiv with short-range Iskander ballistic missiles. The ministry said the destroyed weapons were supplied by the West.

Ukraine's defense ministry said on Twitter that its troops destroyed a Russian landing ship on an island in the Black Sea off the coast of Odesa with Turkish-made Bayraktar TB-2 drones.

Footage shows the landing ship, which appeared to be docked at a port, exploding after being hit and smoke rising from the craft.