Italy has raised the stakes in a spat with the United States over the killing by a U.S. soldier of an Italian intelligence agent in Iraq, saying Washington must set things right by assuming responsibility for the death. Foreign Minister Massimo D’Alema openly challenged the United States at a weekend commemoration of Nicola Calipari, the agent killed on March 4, 2005 at a U.S. military checkpoint near Baghdad airport. Full Story