What the world's markets decided. The same semiconductor story that crushed everything on Friday flipped into a powerful rebound — and split the globe in two.

Korea's chip-heavy KOSPI, the world's best-performing market this year, led losses in Asia with a 5% slide

South Korean technology stocks rebounded sharply on Tuesday as investors returned to AI-linked shares after a steep three-day selloff that had pushed the KOSPI down more than 15%.…