By Natalia Zinets KYIV (Reuters) -Ukraine said on Tuesday its forces were still holding out inside Sievierodonetsk and trying to evacuate civilians, after Russia destroyed the last bridge to the devastated eastern city in a potential turning point in one of the war’s bloodiest battles. Russia said it would give Ukrainian fighters holed up in a chemical plant inside the city a chance to surrender on Wednesday morning. Fighters should “stop their senseless resistance and lay down their arms” from 8 a.m. Moscow time, Interfax news agency quoted Mikhail Mizintsev, head of Russia’s National Defence…