Nippon Steel Corporation v. Heirs of Former Korean Forced Laborers (Case No. Reiwa 4 (Wa) 1097)

In 2025, following South Korean court orders to liquidate seized assets of Nippon Steel to compensate World War II forced labor victims, Nippon Steel filed a counterclaim for damages in Tokyo District Court (Case Reiwa 4 (Wa) 1097) against the heirs of late plaintiff Lee Chun-sik and other beneficiaries. The Japanese steelmaker alleged that the asset seizure and liquidation caused financial harm and violated the 1965 Japan-Korea Claims Settlement Agreement. The lawsuit became a focal point of escalating legal and diplomatic tensions, as Tokyo insisted that all compensation issues were settled by the treaty. The case underscores the prolonged fallout from historical grievances.

As of the knowledge cutoff in 2025, the Tokyo District Court had not yet issued a final ruling. Preliminary proceedings explored the conflict between domestic enforcement and international treaty obligations. Reports suggested the court might dismiss the case, citing the finality of Korean judicial decisions.

Whether the enforcement of South Korean court rulings against a Japanese company violates the 1965 Agreement on the Settlement of Problems Concerning Property and Claims and Economic Cooperation, and whether such enforcement justifies a reverse claim for damages under Japanese law. The interpretation of state immunity and extraterritorial jurisdiction also formed core debates.

The case further strained Japan-South Korea relations, already fragile due to historical issues. It sparked protests in South Korea and criticism from human rights groups who viewed it as an attempt to intimidate forced labor victims. In Japan, it reinforced nationalist sentiment against perceived judicial overreach by Korea. The litigation also impacted economic cooperation, with warnings that continued asset liquidation could lead to tit-for-tat corporate measures. The case was closely watched internationally as a test for resolving post-colonial compensation disputes.