this is bbc news. the headlines: 20 years after first becoming brazil's leader, lula da silva has been sworn in as president again. he's promised sweeping reversals of his far—right predecessor's policies and has revoked jair bolsonaro�*s gun—carrying laws and pledged to reduce deforestation. there have been more air raid warnings in kyiv tonight after a wave of russian missile strikes on the ukrainian capital on new year's day. nato secretary generaljens stoltenberg has said the west must be prepared to provide long—term support to ukraine. thousands of mourners gathered at the vatican after the death of benedict xvi to hear pope francis pay tribute to his predecessor.