Obama spars with Castro on human rights during historic Cuba visit

By Matt Spetalnick and Frank Jack Daniel HAVANA (Reuters) - U.S. President Barack Obama pushed Cuba to improve its record on human rights and sparred with President Raul Castro during a historic visit to the Communist-ruled island on Monday, while Castro hit back by decrying U.S. "double standards". Human rights remained an impediment to strengthening ties with Cuba despite the rapprochement reached by the two leaders in December 2014, Obama said, adding a "full flowering" of the relationship co