Smoke rises above the Azovstal steel plants in Mariupol on April 18.
Mandatory Credit:	Alexander Ermochenko/Reuters

Smoke rises above the Azovstal steel plants in Mariupol on April 18.
Mandatory Credit: Alexander Ermochenko/Reuters

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Mariupol's defenders dig in for last stand as Russia threatens to 'filter' out men

The fate of the Ukrainian city of Mariupol is hanging on an unknown number of defenders making their last stand at an iron and steel plant.