Pope Leo XIV was inaugurated as pontiff in Mass at St Peter's Square. Leo was given the Ring of the Fisherman by a cardinal, symbolising his role and its tradition, which has roots to Saint Peter. World leaders including US Vice-President JD Vance and Ukrainian President Volodymyr Zelensky were among the congregation. Subscribe here: http://bit.ly/1rbfUog For more news, analysis and features visit: www.bbc.com/news #BBCNews