ReutersCopyright: Reuters
The battle for Ukraine's capital Kyiv could be Russia's new Stalingrad, a Ukrainian MP tells the BBC.
Sviatoslav Yurah, Ukraine's youngest ever MP and a former adviser to President Zelensky, is helping with the volunteer defence in Kyiv.
He tells BBC Radio 4's Today programme the capital has been facing a "barrage" of rockets overnight and there are ongoing battles on the outskirts of the city.
But he warns Russia should prepare for heavy losses should it advance on the city.
"It's a massive town of millions and if the Russians try to come in they will have quite a fight on their hands - this will be their Stalingrad if they want to make it so," he says, referring to the bloodiest battle of World War Two, in which about 1.1m Soviet troops and 800,000 Nazi German and Romanian troops died.
The 1942-43 battle was a turning-point, halting the Nazi advance in Russia.
"Nobody is going to surrender - I can definitely guarantee you that," he says.