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US Secretary of State John Kerry (centre R) greets members of the US military, US Embassy personnel, and their families at Collier Field House at the Yongsan Garrison in Seoul on May 18, 2015. Kerry is here to discuss security issues in the wake of a new ballistic missile test by North Korea and the reported execution of its defence chief. AFP PHOTO / POOL / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US Secretary of State John Kerry (centre R) greets members of the US military, US Embassy personnel, and their families at Collier Field House at the Yongsan Garrison in Seoul on May 18, 2015. Kerry is here to discuss security issues in the wake of a new ballistic missile test by North Korea and the reported execution of its defence chief.     AFP PHOTO / POOL / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)