U.S. President Donald Trump crosses the inter-Korean border to become the first sitting U.S. president to step in the Democratic People's Republic of Korea (DPRK) since the end of the 1950-53 Korean War, June 30, 2019. Donald Trump and top DPRK leader Kim Jong Un met and shook hands at the truce village of Panmunjom on Sunday. (Xinhua/NEWSIS)