(Adds report of shelling from Kyiv mayor; U.S. defense secretary on hypersonic missiles) By Pavel Polityuk LVIV, Ukraine (Reuters) – Russian and Ukrainian forces fought for the Ukrainian port city of Mariupol on Sunday, where residents are trapped with little food, water and power, while Ukraine’s president appealed to Israel for help in pushing back Russia’s assault. In the capital, Kyiv, shellfire hit several homes and a shopping centre in the Podil district late on Sunday, killing at least one person, the city’s mayor said. In his latest appeal for help from abroad, Ukrainian President Volo…

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