The signature train belonging to North Korean leader Kim Jong Un has been spotted on satellite images parked at a station on the nation's eastern coast since last week, according to a U.S. monitor, as questions swirl over the dictator's health. Since Kim missed an April 15 commemoration of the 108th birthday of his grandfather, North Korea founder Kim Il Sung, unverified reports have emerged about his health. On Sunday, a key aide to the president of South Korea insisted Kim, who is believed to be 36, was "alive and well." "Our government position is firm," Chung-in Moon, foreign policy...