hello and welcome to bbc news. the ukrainian government has urged the united nations to do more to bring those trapped inside the city of mariupol to safety. it s urged the un secretary general, antonio guterres, to intervene immediately. he s meeting president putin in moscow next week and then travelling on to kyiv. on saturday, there ll be another attempt to establish humanitarian corridors out of the besieged southern port city of mariupol, which russian forces have been trying to fully capture for several weeks. simonjones has the latest. under attack, ukraine s second city, rq. russia was much assault is intensifying. the dangers are clear. despite the destruction, some residents are determined to stay. we destruction, some residents are determined to stay. determined to stay. we are auoin to determined to stay. we are going to fight- determined to stay. we are going to fight. to determined to stay. we are going to fight. to fight - determined to stay. we are going