Global Market: Japan's Nikkei falls 3% as AI spending concerns hit chip stocks; BOJ holds rates

Japanese shares fell sharply as concerns over the profitability of AI investments sparked a global technology sell-off. The Nikkei 225 dropped as much as 3%, led by steep losses in chip and AI-related stocks. Meanwhile, the Bank of Japan held its policy rate at 1.25% but signalled a hawkish stance, leaving the possibility of a future rate increase open.