DONETSK REGION, Ukraine( Reuters)-Ukrainian commander Odin's lower leg was blown off in a mine explosion last year.... He too has returned to the front, as logistics chief for a battalion in the Azov Brigade, which held out for months in defence of the southern city. Ukraine's drained and depleted army needs all the help it can get.... " When I got back from captivity, I realised the war wasn't over," said Mango, who like Odin and most Ukrainian soldiers goes by his military call sign for secu