this. as i mentioned, a second attempt to evacuate civilians from the beseiged southern city of mariupol has failed. both sides blamed the other for not observing an agreed ceasefire. the red cross, which is trying to organise the humanitarian operation, said the city was witnessing �*devastating scenes of human suffering�*. a top security official in ukraine warned that russia is preparing to encircle the city of dnipro — and is focusing on cutting ukraine off from the black sea. 0ur eastern europe correspondent sarah rainsford reports from dnipro. when night falls, they keep the lights off here, in the hope that�*ll hide them from the russian bombs. families who fled the fighting in kharkiv to a nearby town, still too close to feel safe. this is me and my friends in the metro. 15—year—old nika has left behind her city, herfriends and the father she loves, and she�*s struggling.