Abraham M. Denmark served as deputy assistant secretary of defense for East Asia from 2015 through January 2017. Prior to that position, he was senior vice president at The National Bureau of Asian Research. Follow him on Twitter: @AbeDenmark.
TOPSHOT - A man watches a screen showing a graphic of a North Korean missile launch, at a railway station in Seoul on September 15, 2017.
North Korea fired an intermediate range ballistic missile eastwards over Japan and into the Pacific on September 15, the US said, its latest provocation amid high tensions over its banned weapons programmes. / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
SEOUL, SOUTH KOREA - MAY 10: South Korea's new President Moon Jae-In speaks during his presidential inauguration ceremony at National Assembly on May 10, 2017 in Seoul, South Korea. Moon Jae-in of Democratic Party, was elected as the new president of South Korea in the election held on May 9, 2017. (Photo by Chung Sung-Jun/Getty Images)
FREDERIC J. BROWN/AFP/Getty Images