President Trump stepped back on Wednesday from his insistence that the United States needs to "own" Greenland to ensure U.S. national security.  After talks with NATO Secretary General Mark Rutte on the sidelines of the World Economic Forum in Davos, he dropped his threat to impose tariffs against eight of America's closest allies and then said the framework of a plan to resolve his administration's standoff with Europe had been reached.  Mr. Trump called it an "ultimate long-term deal" on