A fresh effort is underway to evacuate trapped civilians from the besieged city of Mariupol as Ukrainian forces brace for a renewed Russian offensive in the east. Ukrainian officials said they’re sending a convoy of buses to evacuate people from Mariupol on Thursday after Russia said it was ready to observe a one-day ceasefire in the city, where tens of thousands of civilians remain trapped after weeks of heavy bombardment. Ukraine’s Deputy Prime Minister Iryna Vereschuk said that 45 buses were being sent to Mariupol after the Red Cross notified Ukrainian authorities Russia’s defense ministry had agreed to open access for a humanitarian convoy. “We will do everything possible so that buses enter Mariupol today and pick up people who have not yet been able to get out of the city,” Vereschuk said, Interfax reported. The Mariupol mayor’s office estimates that nearly 5,000 people have been killed in the besieged …