Japan's wartime atrocities still cast a long shadow across the Asia-Pacific

Japanese lawmakers were reportedly preparing to submit a bill in early July to provide aid to surviving civilian victims of the Pacific War, part of World War II, reopening debate over Japan's handling of its wartime past.

The bill would compensate civilians affected by wartime air raids and other damage and would be the first of its kind introduced to parliament in 38 years, according to Japan Today.

While the bill focuses on Japanese civilian victims, memories of Japan's wartime aggression remain deeply rooted across the Asia-Pacific, where military campaigns left millions dead through massacres, biological warfare, human experimentation, forced labor and the abuse of prisoners of war.

Below are some of the most notorious atrocities committed by the Japanese military during the Pacific War.

In China: The Nanjing Massacre claimed more than 300,000 lives

On December 13, 1937, Japanese forces captured east China's Nanjing. Over the following six weeks, troops carried out widespread killings, raping, looting and arson in what became known as the Nanjing Massacre.

According to findings by the postwar Nanjing War Crimes Tribunal, Japanese troops were responsible for 28 documented cases of mass executions that killed about 190,000 people, along with hundreds of smaller-scale killings that claimed another 150,000 lives, bringing the estimated death toll to more than 300,000.

After World War II, both the International Military Tribunal for the Far East in Tokyo and the Nanjing War Crimes Tribunal prosecuted those responsible. Japanese General Hisao Tani was sentenced to death for his role in the massacre.

In Singapore: Unit 9420 and plague-infected fleas

In June 1942, the Japanese military established "Oka 9420 Unit" (Unit 9420), headquartered in Singapore with branches across Southeast Asia. It became Japan's largest biological warfare unit outside China. Although officially tasked with water purification and epidemic prevention, the unit secretly produced plague-infected fleas for use as biological weapons.

The personnel of Unit 9420 included members transferred from several biological warfare units, including the notorious Unit 731 in China's Harbin, Unit 1644 in Nanjing.

According to Singaporean scholar Lim Shao Bin, Unit 9420 produced large quantities of plague bacteria as part of a plan to attack the US West Coast. Although the attack was never carried out, survivor testimony indicates that the unit built production facilities for plague-infected fleas in present-day Singapore and Malaysia and transported them by rail to Thailand. Lim's research suggests some of these biological weapons may have been deployed on the China-Myanmar front.

The unit also conducted human experiments in Indonesia, including tetanus experiments on forced laborers that directly resulted in hundreds of deaths.

In Philippines: The Bataan Death March killed more than 15,000 prisoners 

After Japanese forces invaded the Philippines in December 1941, the Bataan Peninsula became the scene of fierce fighting. Facing overwhelming odds and severe shortages of food and supplies, approximately 78,000 Filipino and American troops surrendered on April 9, 1942.

The prisoners were then forced to march about 120 kilometers to Camp O'Donnell. Along the way, Japanese troops denied them food and water, while those who collapsed or fell behind were immediately executed. Japanese guards made a sport of hurting or killing prisoners of war, beating them with rifle butts, shooting or bayoneting them without reason.

More than 15,000 people died during the march from starvation, dehydration, disease and abuse, making it one of the deadliest episodes of prisoner mistreatment during World War II.

In Myanmar and Thailand: The 'Death Railway' workers suffered 37.5% mortality rate

Soon after occupying Myanmar and Thailand in 1942, Japan began constructing the Thai-Burma Railway to transport troops and secure access to strategic resources in Southeast Asia.

The 415-kilometer railway was built largely by forced labor. More than 400,000 people took part in the project, including about 12,000 Japanese railway troops, 62,000 Allied prisoners of war captured in Singapore and Myanmar, and more than 350,000 laborers from across Southeast Asia.

Workers endured brutal conditions, often laboring from before dawn until late at night with little food, inadequate medical care and unsafe drinking water. Malnutrition, tropical diseases and physical abuse were widespread.

When the railway was completed in October 1943, nearly 150,000 workers had died, representing an estimated mortality rate of about 37.5%. On average, one life was lost for every 3 meters of railway built.

More than eight decades later, the suffering caused by Japan's wartime aggression continues to cast a long shadow over the Asia-Pacific. 

Remembering that history is not only about preserving the truth of what happened, but also about learning its lessons. Confronting the past with honesty and remaining vigilant against any revival of Japanese militarism are essential to preventing history from repeating itself and to safeguarding lasting peace and stability in the Asia-Pacific.