Three years after Ukraine’s army was desperately defending the port of Mariupol, the wives of soldiers who were captured when it finally fell are still fighting to bring them home from Russia, and have asked US president Donald Trump to help their cause. The start of Russia’s devastating attack on the city was vividly documented in the Oscar-winning film 20 Days in Mariupol, but the battle raged on for almost three months, ending only in May 2022 when Kyiv ordered some 2,500 troops to lay down arms and leave the vast Azovstal steelworks that they had turned into a fortress....