The Russian authorities say all those surrendering will be treated in line with international standards.

But there are fears that fighters could face prosecution by President Putin's courts from Moscow are Russia editor steve Rosenberg reports, tired and wounded.

Moscow released these images of Ukrainian fighters leaving the steelworks they've been defending in Mariupol, giving themselves up to the Russians.

Ukraine is hoping for a prisoner swap.

But in Russia there are calls to put some of the soldiers on trial for war crimes.

They are killers, they are criminals, but we give them medical care.

But your country invaded Ukraine with More than 100,000 troops.

That's aggression, isn't it?

No, it's not an aggression.

It's not an aggression.

Don't bully us.

Moscow tries to justify invading Ukraine with a false claim that it's gone in to fight Nazis.

A war crimes trial could shore up an unconvincing narrative.

The Kremlin wants Russians to believe that in Ukraine their army is battling Nazis and NATO europe and America were all plotting a way to attack and destroy the motherland and there are many here who believe this parallel reality.

But not everyone does.

Dmitry schoolchildren admits that his country Russia is the aggressor.

He is appalled by the bloodshed and wants his whole town to know it.

He's transformed the outside of his shop into a message board with the names of Ukrainian towns.

Russia's attacked her son, european Kiev peace to Ukraine.

It says he's even turned his roof into the Ukrainian flag.

I thought this would be a good way of getting information out because for the first few weeks of the war, our people didn't know what was happening.

They didn't know that Russia was shelling cities.

Some don't want to know, traitor has been graffitied on Dimitri's door and the police have been round.

He's been fined for discrediting the army.

The front of the shop isn't for expressing opinions.

She says he can say what he thinks says Anton I think attacking a neighboring country is a strange thing to do and that's what and in Russia protesting can be a dangerous thing to do.

But Dimitri is refusing to stay silent.

Steve Rosenberg BBC news Moscow.