SEOUL, South Korea — The chief executive of a South Korean lithium battery maker where 23 workers were killed in a fire last year was sentenced to 15 years in prison on Tuesday in the toughest ruling over an industrial accident in the country. Park Soon-kwan, CEO of the battery maker Aricell, had been charged under the country’s industrial safety law, which subjects senior executives to prison terms of more than one year when found guilty in the event of fatal accidents.

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