By Natalia Zinets (Reuters) – Ukraine proposed talks with Moscow over evacuating troops and civilians from Mariupol after a Russian surrender-or-die ultimatum expired on Wednesday, leaving many trapped at a steel plant, the last main stronghold of resistance. A few dozen civilians managed to leave the strategically important southeastern port in a small bus convoy, according to Reuters witnesses, escaping the fiercest battle of the nearly eight-week-long war. A Ukrainian marine commander, Serhiy Volny, said fighters there may not be able to hold out for much longer. President Volodymyr Zelensk…