Damages Claim Appeal (Korean Forced Laborers v. Japan)

In 2026, the Tokyo High Court adjudicated an appeal in a damages lawsuit brought by South Korean victims of wartime forced labor and their families against the Japanese government and Nippon Steel. The plaintiffs sought compensation for brutal treatment and unpaid wages suffered during World War II. The lower court had dismissed the suit, citing the 1965 Japan-Korea Claims Agreement and the principle of state immunity. On appeal, the victims argued that crimes against humanity are exempt from sovereign immunity and that the bilateral treaty never extinguished individual claims. The court examined customary international law, precedent from the International Court of Justice, and the scope of the 1965 accord. It ultimately ruled that Japan retains immunity for sovereign acts and that the agreement comprehensively settled all state-to-state and private claims. The judgment acknowledged historical suffering but deferred to diplomatic resolution, marking another chapter in the long-running legal battle over colonial-era atrocities.

The Tokyo High Court dismissed the appeal, affirming the lower court's decision. It held that Japan enjoys immunity from foreign civil claims for sovereign acts, that no jus cogens exception to state immunity has crystallized in customary international law, and that the 1965 treaty waived all categories of claims. The court expressed sympathy for the plaintiffs but concluded that any further remedy must come through diplomatic channels.

Whether state immunity bars domestic courts from hearing claims arising from crimes against humanity committed during armed conflict; whether the 1965 Agreement on the Settlement of Problems Concerning Property and Claims between Japan and the Republic of Korea extinguished individual victims' right to seek compensation.

The ruling intensified diplomatic friction between Japan and South Korea, provoking mass protests in Seoul and condemnation from United Nations human rights experts. It fueled public demands in South Korea to abrogate the 1965 settlement and reinforced calls for Japan to confront its colonial past. The decision also chilled bilateral security and trade cooperation, complicating trilateral dynamics with the United States and casting a shadow over ongoing efforts to heal historical wounds in East Asia.