The Democratic People's Republic of Korea on Wednesday fired the sixth suspected Musudan intermediate-range ballistic missile, the second in the day, which flew 400 kilometers, nearing to a required distance to be successful.

An official at Republic of Korea's defense ministry said military authorities of ROK and the United States are conducting detailed analysis on whether the test-launch was successful.

Seoul believed that a ballistic missile is required to fly at least 300 km to be considered successful in a test-firing, while Yonhap news agency reported that a ballistic missile should fly at least 500 km to be successful.