Photo released on Aug 21, 2015 by the State Archives Administration of China on its website shows a picture of Japanese war criminal Soichi Nakajima. [Photo/Xinhua]

BEIJING - Confessions by Japanese war criminals released Friday reveal soldiers tortured civilians for pleasure during the invasion in World War II.

According to the written confession of Soichi Nakajima published by the State Archives Administration (SAA), he tortured a Russian woman and found joy in doing so.

Soichi Nakajima joined the Japanese War of Aggression against China in 1932, stationed in today's Heilongjiang province, and was captured in October 1945.

While assisting the foreign affairs director in interrogating the Russian woman they captured, he tied the captive to a bench and force fed her dirty bath water. After the woman's belly was full, he pressed her stomach until she threw up the water and repeated the process several times.

"I even went to her cell, watched the woman holding her bloated belly in pain and felt pleased," the confession read.

Soichi Nakajima was on guard when a captured Chinese man was beheaded, and he took out the brain of the victim to burn, and ate it as medicine for venereal disease. He also gave part of it to others.

Friday's release was the 11th of a series of 31 confessions from Japanese war criminals published on the SAA website in commemoration of the 70th anniversary of the end of WWII.