NHK Terminates AI Translation Service After Geopolitical Naming Error

NHK announced the termination of its AI-powered multilingual subtitle service after an automatic translation error rendered "Senkaku Islands" as "Diaoyu Islands," the Chinese designation. The mistake, discovered on February 10th, 2025 during a news segment, led NHK to deem the service inappropriate. The AI-based subtitles, powered by Google Translate, had been in use since 2020.

Risk classification

• Primary risk domain: 7 AI system safety, failures, & limitations
• Primary risk subdomain: 7.3 Lack of capability or robustness

The incident was caused by a lack of robustness in the AI translation system, which failed to reliably translate sensitive geopolitical terms, leading to incorrect outputs.

Additional risk subdomains

• 3.1 False or misleading information: The translation error resulted in the broadcast of incorrect and politically sensitive terminology ('Diaoyu Islands' instead of 'Senkaku Islands') to viewers.

Causal factors

• Entity: AI
• Intent: Unintentional
• Timing: Post-deployment

The translation error was an unexpected outcome produced by the AI system after it was deployed for live broadcasting.

EU AI Act risk tier

• Risk tier: 4 Minimal or No Risk

Minimal or No Risk: The system is a standard machine translation tool (Google Translate API) used for generating subtitles, which poses low risk to safety or fundamental rights under the EU AI Act definitions.

AI system and alleged parties

• AI system: Google Translate API (Google)
• AI purpose: Translation; Audio Localization
• Behaviour type: Tool
• Alleged developer: Google
• Alleged deployer: NHK
• Alleged harmed parties: Public trust in the media, NHK viewers, NHK, Japan-China relations, Government of Japan

Harm severity

Severity ratings are based on this scale.

Highest direct severity in any category: Negligible. Severity is scored from Negligible to Catastrophic in each harm category, for harm the reports describe as caused directly or indirectly by the AI system.

• Physical: direct Negligible, indirect Negligible
• Infrastructure: direct Negligible, indirect Negligible
• Property: direct Negligible, indirect Negligible
• Financial: direct Negligible, indirect Negligible
• Environmental: direct Negligible, indirect Negligible
• Malicious content: direct Negligible, indirect Negligible
• Differential treatment: direct Negligible, indirect Negligible
• Civil rights: direct Negligible, indirect Negligible
• Democracy: direct Negligible, indirect Negligible
• Privacy: direct Negligible, indirect Negligible
• Psychological: direct Negligible, indirect Negligible
• Epistemic: direct Negligible, indirect Negligible
• Child sexual exploitation and abuse: direct Negligible, indirect Negligible

People affected

• Occurrences reported: 5

Potential causes

Management

• Premature Service Deployment: Management deployed and expanded the service without resolving safety risks.
• Lack of Risk Assessment: Management failed to assess geopolitical risks of automated translation.

Technology

• Unstable AI Translation Engine: Google AI translation API translated Senkaku to Chinese Diaoyu.
• Lack of Custom Translation System: NHK relied on a generic third-party API instead of a specialized system.
• No Post-Processing Term Filter: The system lacked a blocklist or translation override for sensitive terms.

Data Inputs

• Biased Translation Training Data: The underlying AI model was trained on data associating Senkaku with Diaoyu.
• Ambiguous Source Audio Input: Real-time speech-to-text or English subtitle inputs fed directly to AI.

Human Factors

• Delayed Human Detection: An employee noticed the translation error only after it was broadcasted.
• Over-reliance on Automated Systems: Staff trusted the AI to handle sensitive news without real-time oversight.

Process and Methods

• Real-Time Direct Streaming: Subtitles were displayed live without a delay mechanism for review.
• Inadequate Quality Control: No pre-broadcast validation process for automated translations.
• Reliance on Simple Disclaimers: Using 'translation may not be perfect' warning instead of active control.

Information quality

• Classification confidence: High
• Reason for confidence: The reports from multiple reputable sources (NHK, Yomiuri, Yahoo Japan) consistently describe the incident, the specific translation error, the AI technology used (Google Translate API), and the subsequent action taken by NHK to terminate the service. There are no major contradictions.
• Ambiguities identified: The exact number of viewers exposed to the incorrect subtitles is not specified.
• Alternative interpretations: None.

NHK terminated its AI-powered multilingual subtitle service after Google Translate incorrectly translated the Japanese-controlled Senkaku Islands using the Chinese name Diaoyu Islands during a live broadcast. The incident highlights the risks of using fully autonomous translation tools for politically sensitive national broadcasts without real-time human oversight.

• Overall national security impact: Minor
• Scope: Single nation
• Primary target: Japan
• Other affected: China
• Alleged perpetrator: Unknown

Threat characteristics

• Imminence: Long-term. The incident is resolved as NHK has terminated the service. Any remaining concerns are long-term strategic issues regarding AI translation reliability.
• Autonomy: Full autonomy. The AI translation system operated in real-time to translate and broadcast subtitles directly to viewers without prior human review.
• Novelty: Established threat. Machine translation errors, even on sensitive geopolitical terms, are well-established technical limitations of AI translation tools.

Impact by dimension

• Physical security: Negligible. No physical systems, critical infrastructure, or human safety were impacted or threatened by this translation error.
• Information security: Minor. Unintentional translation error on a public broadcast regarding a sensitive territorial dispute. Not an active disinformation campaign, but caused public diplomatic embarrassment.
• Sovereignty: Minor. Involves a sensitive territorial dispute (Senkaku/Diaoyu Islands) on a national broadcaster, but did not compromise state authority, border control, or government operations.
• Economic security: Negligible. Minimal economic impact, limited to NHK terminating its subtitle service and planning future proprietary development costs.
• Societal stability: Negligible. No threat to societal stability, civil liberties, or population safety. Only resulted in temporary viewer confusion or diplomatic awkwardness.