Korea’s Kospi crashes 6%, nosediving 25% from June peak. What’s rattling investors today?

South Korea's benchmark Kospi index plunged 6% on Monday as rising tensions in the Gulf and soaring oil prices rattled global markets. The selloff, led by sharp declines in AI-heavyweights SK Hynix and Samsung Electronics, pushed the index deeper into bear market territory, although it remains the world's best-performing major stock market in 2026.

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