China News recently reported that an official (who would prefer to remain anonymous) of the South Korean Defense Ministry advised that the deputy defense ministers of South Korea, the United States, and Japan planned to sign a memorandum of understanding on sharing intelligence involving North Korea, especially on military topics like nuclear plans and guided missiles. The memorandum was set to be signed on December 29. The South Korean side emphasized that the intelligence sharing between South Korea and Japan will be communicated indirectly via the United States as the middle man. The Memorandum is not considered legally binding and does not require approval by the legislative branches of the three countries.
Source: China News, December 27, 2014