As per Ukrainian authorities, this is a video posted by Adviser to the Mayor of Mariupol Petro Andryushchenko thatshows Russian attacks on the port city amid continuing resistance by Ukrainian forces (Azov Battalion). The Azovstal steelplant is their last stronghold where they are 'trapped' amid Russian attacks, calls for surrender, and allegations of trapping civilians with them, who Ukraine says are taking "shelter".