STORY: The Ukrainian military said there was no let-up on Sunday in Russia's bombardment of the steel works in the southern port, where a few hundred Ukrainian fighters are holding out.
The video was posted on the Telegram messaging application by Alexander Khodakovsky, a commander of the pro-Russian self-proclaimed republic of Donetsk.
"If you didn't know what it is and for what purpose - you could say that it's even beautiful," Khodakovsky said in a message beside the video. Khodakovsky could not be immediately reached for comment.
Russian forces pummeled the port city for nearly two months, turning Mariupol into a wasteland as the war in Ukraine escalated.
Groups of Ukrainian fighters and civilians took to the Azovstal works - a vast Soviet-era plant founded under Josef Stalin and designed with a labyrinth of bunkers and tunnels to withstand attack.
Civilians have been evacuated from the bunkers but Ukrainian fighters remain holed up there.