The second-ranking diplomats from Japan, the United States and South Korea agreed Friday to continue close coordination on North Korea and other challenges to regional and global stability, with a plan to set up a new coordinating body to further align their policies. U.S. Deputy Secretary of State Kurt Campbell said the envisioned body will likely be “a secretariat of some kind” at the outset of a meeting he hosted for his Japanese and South Korean counterparts at his farmhouse in a tiny Virginia village near Washington. Campbell, in the presence of the press, also said the three countries ar…