Russian President Vladimir Putin has said that shelling of the besieged Ukrainian city of Mariupol will only end when Ukrainian troops surrender.

Mr. Putin made the comments during an hour long phone call with French President Emmanuel Macron on Tuesday night, the Kremlin said in a statement.

But French officials said the Russian leader had agreed to consider plans to evacuate civilians from the city.

Russia later proposed a one-day ceasefire for Thursday.

The defence ministry said the ceasefire would start at 10:00 local time (08:00 BST) and would allow people to travel westwards to Zaporizhzhia via the Russian-controlled port of Berdyansk.

On Thursday morning, Ukrainian deputy prime minister Iryna Vereshchuk said a convoy of Ukrainian buses was on its way to Mariupol to try to evacuate civilians.

She said the International Committee of the Red Cross had confirmed that Russia had agreed to open a humanitarian corridor to the city.

Previous attempts to establish a ceasefire in Mariupol have collapsed amid accusations of bad faith from both sides. Russia has also been accused of forcibly relocating thousands of civilians to Russia or Russian-controlled areas.

The announcement comes as new satellite photos showed the destruction caused by the shelling.

The images, released by the Earth observation company Maxar, showed that residential areas have been reduced to rubble and highlighted Russian artillery cannons in firing positions on the outskirts of the city.

Officials from France's Elyseé palace called the situation in the city "catastrophic" and added that "civilian populations must be protected and must leave the city if they wish to. They must have access to food aid, water and the medicines they need".

"This much degraded humanitarian situation is linked to the siege of the city by the Russian armed forces," the statement said.

France, along with Turkey, Greece and several humanitarian groups, has presented Mr. Putin with a plan to evacuate the city.

Officials said that Mr. Putin told Mr. Macron that he will "think about" the proposal.

But in its readout of the call, the Kremlin appeared to suggest that Mr. Putin has provided no such assurances.

Russian officials said Mr. Putin told the French leader that "in order to resolve the difficult humanitarian situation in this city, Ukrainian nationalist militants must stop resisting and lay down their arms".

The statement added that Mr. Putin had given Mr. Macron "detailed information about measures taken by the Russian military to provide emergency humanitarian assistance and ensure the safe evacuation" of civilians from the besieged south-eastern city.

Ukraine has accused Russia of forcibly relocating thousands of people from Mariupol to Russian-held territory. (BBC)

•PHOTO: A woman uses a mobile phone to take a picture of a new work by Italian street artist TvBoy that depicts Russian President Vladimir Putin in prison.