Mariupol under siege: Art school sheltering 400 Ukrainians is bombed as Russian troops fire more 'lung-busting' thermobaric rockets - and Zelensky condemns 'terror that will be remembered for centuries' The city council in the besieged city of Mariupol claimed an art school sheltering 400 people was bombed Ukraine president Zelensky said Russia's siege was a 'terror that would be remembered for ..