Shares in Kolmar Korea, whose clients include Unilever, fell 6.2% on Friday after a storm of online protest over the video, which the firm said later had been intended as training for employees on how not to react too emotionally to issues.The two countries are locked in bitter trade and diplomatic rows over a South Korean court ruling late last year that ordered Japanese firms to compensate forced labourers during Japan’s occupation.

Japan warned on Thursday it could broaden export restrictions to South Korea beyond three chipmaking materials put under export control last month.During staff meetings this week, Kolmar Korea chairman Yoon Dong-han played a YouTube video that criticised South Korean President Moon Jae-in and praised Japan’s Prime Minister Shinzo Abe, according to So…