Ukrainian firefighters extinguish a blaze at a warehouse after a bombing in Kyiv, Ukraine on Thursday. Russian forces destroyed a theater in Mariupol where hundreds of people were sheltering Wednesday and rained fire on other cities, Ukrainian authorities said, even as the two sides projected optimism over efforts to negotiate an end to the fighting. VADIM GHIRDA
By Andrea Rosa Associated Press KYIV, Ukraine (AP) — Rescue workers searched for survivors Thursday in the ruins of a theater blown apart by a…