By Alessandra Prentice and Natalia Zinets KYIV (Reuters) – In the years prior to Russia’s invasion of Ukraine, the port city of Mariupol was undergoing a makeover. More than $600 million was spent on new roads, a children’s hospital and parks to modernise the mainly Russian-speaking city as part of a campaign to show the benefits of life in West-leaning Ukraine following Russia’s annexation of Crimea in 2014. “We lived well, happily,” said Maria Danylova, 24, who moved into a new apartment in the city last August after she married. Like most of her family she works for steel giant Metinvest, w…