Japanese government leaders and U.S. Defense Secretary Jim Mattis agreed Friday to work together to achieve North Korea's denuclearization and beef up their alliance deterrence as diplomatic efforts continue to advance nuclear negotiations.During a series of talks with Japanese Prime Minister Shinzo Abe and other ministers in Tokyo, Mattis offered various reassurances to Japan, including the oft-repeated defense pledge to the key Asia ally, after a suspension of U.S.-South Korea military drills sparked concern about the U.S. commitment to the region."We are in the midst of very unprecedente…READ FULL ARTICLE