Kyiv said an official from Russia's presidential administration had arrived in the strategic southern port city, which has been largely destroyed in Russia's more than two-month invasion of Ukraine, to oversee plans for the Victory Day parade.

"Mariupol will become a centre of 'celebration,'" Ukraine's military intelligence said in a statement on social media.

"The central streets of the city are urgently being cleaned of debris, bodies and unexploded ordnance," it added.

Mariupol is among the most battered cities in Ukraine. A group of Ukrainian forces are still holding out in its Azovstal steel plant.

"A large-scale propaganda campaign is underway. Russians will be shown stories about the 'joy' of locals from meeting the occupiers," the military intelligence statement said.

The Ukrainian military said Tuesday that Russian forces had launched an offensive on Azovstal shortly after the United Nations and Red Cross confirmed that more than 100 civilians had been evacuated from the plant.

On Wednesday, the Kremlin denied Russia was storming the plant.

In a briefing on the army's plan for May 9, Russian Defence Minister Sergei Shoigu made no mention of a celebratory military march in Mariupol.

He said that parades would take place in 28 cities and involve some 65,000 people, 2,400 pieces of military hardware and more than 400 aircraft.

Russians celebrate Victory Day every year on May 9 with military parades and public events commemorating the anniversary of the Soviet Union's defeat of Nazi Germany in World War II.

Moscow has previously said the purpose of its invasion of Ukraine is to "de-militarise" and "de-Nazify" Ukraine.