Deputy secretary-general Mark Malloch Brown said the US needs to tell its people why the UN matters Picture: AFP/Getty THE United Nations' British second-in-command was at the centre of a furious diplomatic row with the United States yesterday. The UN deputy secretary-general, Mark Malloch Brown, antagonised Washington after suggesting that the US administration was happy to use the UN as a diplomatic tool while failing to defend it from critics at home. Mr Malloch Brown told a conference in New York that "the prevailing [US] practice of seeking to use the UN almost by stealth as a diplomatic tool while...