SEOUL, May 21 (Reuters) - A missile launched by North Korea on Sunday flew about 500 kilometers (310 miles) and was believed to have landed in waters off its east coast, South Korea's military said.

South Korea's Office of Joint Chiefs of Staff said South Korea and the United States were conducting close-up analysis of the launch. (Reporting by Ju-min Park; Editing by Raju Gopalakrishnan; Editing by)