The mother of Kenneth Bae, a Korean-American who is being held in North Korea and is in failing health, visited him in a Pyongyang hospital on Friday and told Japan’s Kyodo News agency that his condition appeared to have improved. Enlarge This Image Uncredited/Courtesy Terri Chung, via Associated Press Kenneth Bae, right, and his parents in an undated photo provided by the family. Connect With Us on Twitter Follow @nytimesworld for international breaking news and headlines. Twitter List: Reporters and Editors The mother, Myunghee Bae, 69, was permitted by the North Korean authorities to enter the country on Thursday for a five-day stay after her repeated requests to see her son, who has been…