North Korea pulled its staff out of a joint liaison office with South Korea on Friday on short notice, the South's Unification Ministry said.Since the office was set up in an industrial park in Kaesong near the North Korean border with the South in September, weekly meetings had been held between the two sides. But no meeting has been held since Feb. 22.The North Korean side has explained the staff withdrawal as being at the instruction of superiors, the ministry said, adding that it hopes the staff will return quickly to normalize the office's operations.in Seoul, the National Security Cou…READ FULL ARTICLE