SEOUL - South Korea said on Monday North Korea appeared to have secured 'meaningful data' from its latest missile test on Sunday, when it launched an intermediate-range ballistic missile. 'South Korean and US intelligence authorities believe North Korea has secured meaningful data in enhancing the credibility of its missile technology,' said Roh Jae-cheon, a spokesman for South Korea's Joint Chiefs of Staff. Roh said further verification was needed to determine whether the North had mastered the re-entry technology for missile warheads that it has claimed.