been reporting, people are when using words like apocalyptic, barbaric, primevalwhen using words like apocalyptic, barbaric, primeval when people are living without food, water, heating. while russia uses this medieval tactic of siege and shelling to try to bring the city to submission. abs, to bring the city to submission. a dire situation there in mariupol in that strategic port city. thank you so much for bringing us up—to—date with all of you reporting there from the capital kyiv. britain and america have accused russia of manufacturing a fake story to justify carrying out a possible chemical attack in ukraine. moscow has requested a meeting of the un security council claiming — without providing evidence — that the us has been developing biological weapons in the country. washington has rejected the russian claims as "laughable". our security correspondent, frank gardner, reports. this is the aftermath