Ukraine's President Volodymyr Zelensky says Russian shelling is preventing authorities in the besieged southern city of Mariupol to effectively establish humanitarian corridors, APA reports citing CNN.
The Russian military says fighting has reached the centre of the city, where thousands of people remain trapped.
In his latest address to the nation, Zelensky says hundreds of people are still trapped beneath the rubble of a theatre there that was bombed on Thursday.
Zelensky also says Western deliveries of arms to Ukraine are too slow.
"We again remind certain Western leaders that it will be a moral defeat for them... if Ukraine does not receive advanced weapons," he says.