Japan stock rally tempered by volatile South Korea market

Global investors increasingly trade AI-heavy Nikkei average and KOSPI as one

Both the Japan's Nikkei Stock Average and South Korea's KOSPI gained sharply on Aug.

TOKYO -- Japan's Nikkei Stock Average gained more than 2,000 points Wednesday, but many investors remain cautious about joining the rally as Japanese stocks appear increasingly linked to the volatile South Korean stock market.

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