(Reuters) – Russia resumed its assault on the last Ukrainian defenders holed up in a giant steel works in Mariupol, a Ukrainian official said, days after Moscow declared victory in the southern port city and said its forces did not need to take the factory. FIGHTING * An artillery strike on the front line town of Zolote in Ukraine’s eastern Luhansk region killed two civilians and wounded two others, Governor Serhiy Haidai said. * A missile struck infrastructure in the Ukrainian port city of Odesa, the local authorities said in an online statement, without giving further details. * Russia’s def…