Delegates from China, South Korea and Japan pose for photos during an assembly at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Aug. 15, 2016. Monday marked the 71st anniversary of Japan's unconditional surrender at the end of world War II. (Xinhua/Sun Can)

A survivor of Nanjing Massacre pays tribute to victims during an assembly at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Aug. 15, 2016. Monday marked the 71st anniversary of Japan's unconditional surrender at the end of world War II. (Xinhua/Sun Can)

A Japanese delegate attends an assembly at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Aug. 15, 2016. Monday marked the 71st anniversary of Japan's unconditional surrender at the end of world War II. (Xinhua/Sun Can)

Delegates from China, South Korea and Japan pose for photos during an assembly at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Aug. 15, 2016. Monday marked the 71st anniversary of Japan's unconditional surrender at the end of world War II. (Xinhua/Sun Can)

Delegates from Japan present a wreath to victims of the Nanjing Massacre during an assembly at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Aug. 15, 2016. Monday marked the 71st anniversary of Japan's unconditional surrender at the end of world War II. (Xinhua/Sun Can)