Photo taken on Feb. 25, 2019 shows national flags of Vietnam, the DPRK and the United States in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wang Shen)
Photo taken on Feb. 25, 2019 shows national flags of Vietnam, the DPRK and the United States in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wu Xiaochu)
Photo taken on Feb. 25, 2019 shows a billboard of the DPRK-U.S. summit in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wu Xiaochu)
Photo taken on Feb. 25, 2019 shows a billboard of the DPRK-U.S. summit in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wu Xiaochu)
Photo taken on Feb. 25, 2019 shows a billboard of the DPRK-U.S. summit in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wu Xiaochu)
Photo taken on Feb. 25, 2019 shows billboards of the DPRK-U.S. summit in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wu Xiaochu)
Photo taken on Feb. 25, 2019 shows a billboard of the DPRK-U.S. summit in Hanoi, Vietnam. The second summit between top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un and U.S. President Donald Trump will be held in Hanoi on Feb. 27-28. (Xinhua/Wang Shen)