At least 3,000 people were used as human guinea pigs by Unit 731, and more than 300,000 people across China were killed by Japan's biological weapons, according to the Museum of Evidence of War Crimes by Japanese Army Unit 731 in Harbin.
"President Xi's re-election is also a positive sign of China's continued prosperity, going into a new era that will be great for the world both in terms of stability and economic development," he said.
Unit 731 was a top-secret biological and chemical warfare research base set up in 1935 in Harbin by the Japanese military. It was the nerve center of Japan's biological warfare in China and Southeast Asia during World War II.
In the new era, Hainan will further reform and opening-up as a special economic zone and international tourism site.