About the Authors
Dagyum Ji
Dagyum Ji was a senior NK News correspondent based in Seoul. She previously worked for Reuters TV.
Oliver Hotham
Oliver Hotham was an NK News contributor based in Seoul, South Korea. Follow him on Twitter.
South Korean President Moon Jae-in has ordered his government to devise the "strongest" measures, including pushing for new sanctions, in response to North Korea's sixth nuclear test, the Blue House announced on Sunday.
Moon convened a meeting of the National Security Council (NSC) from 1330 to 1500 KST.