By Tom Balmforth IZIUM, Ukraine (Reuters) – Across a damaged footbridge over the river Siverskyi Donets, shrapnel-sprayed walls and charred Soviet-era housing stand in a panorama of provincial devastation in Ukraine’s liberated town of Izium. Exhausted residents said they were elated by the end of six months of Russian occupation delivered by Ukraine’s counter-attack last week, but voiced grave fears at a winter of looming energy shortages – and the lingering threat from Russia. “We lived through this (for) six months. We sat it out in cellars. We went through everything it is possible to go t…