New U.S. Ambassador William Hagerty, a businessman close to President Donald Trump, on Thursday expressed his determination to deepen security and economic ties between his country and Japan, underlining their alliance as "ironclad."Upon arriving at Narita airport near Tokyo, Hagerty also told a press conference that he aims to boost the bilateral partnership amid threats from North Korea. "I expect to see that partnership grow stronger in the face of the rising threats in the region," he said.The security environment in the Asia-Pacific region has worsened amid North Korea's attempt to dev…READ FULL ARTICLE