North Korean leader Kim Jong Un waves to the members of the Korean People's Army in this undated photo released by North Korea's Korean Central News Agency (KCNA) May 13, 2017. KCNA/via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. SOUTH KOREA OUT.