KYIV (Reuters) – As Ukrainian fighters left the Azovstal steelworks in Mariupol this week and ended their dramatic last stand against Russia’s siege, Mariia Zimareva tried in vain to spot her husband amid the flood of news pictures being published. The 19-year-old, who is five months pregnant, learned from her 22-year-old husband’s unit on Wednesday that he was on a list of soldiers who had been taken from the steelworks to the Russian-controlled town of Olenivka near the regional capital Donetsk. Uncertainty now swirls over the fate of the fighters, who Kyiv wants returned in a prisoner swap….