By Alessandra Prentice and Natalia Zinets ZAPORIZHZHIA, Ukraine (Reuters) -Scores of Ukrainian civilians including women and children were trapped on Thursday in underground bunkers at a steel works in the ruined port city of Mariupol, although President Vladimir Putin said Russia was ready to allow them to leave safely. Putin told Israeli Prime Minister Naftali Bennett in a phone call that Kyiv should order Ukrainian fighters defending the besieged Azovstal plant to disarm, and Russia was still prepared to provide safe passage out for civilians. Ukrainian defenders at the site have clung on d…