HONG KONG - The Kospi in South Korea plunged 10% as tech shares took a battering on another black day for Asian stock markets, with a report of a breakthrough in China’s chip industry compounding worries about the longevity of the AI boom.

Korean stocks plummeted more than 8 percent late Tuesday morning as investors dumped tech shares amid heightened fears over artificial intelligence...

South Korea's Kospi index has plunged over 10% on heavy selling of chipmaking stocks that have gyrated recently due to concerns over the sustainability of the boom in artificial…