South Korea's KOSPI index fell 6.00% intraday to 6,343.87 points.

Microsoft on July 27 released MAI-Cyber-1-Flash, its first cybersecurity-specific AI model, and integrated it into its multi-agent vulnerability detection and remediation platform MDASH. Microsoft (MSFT.O) said the combination scored 95.95% on the CyberGym vulnerability-detection benchmark, outperforming MYTHOS, GEMINI and GPT-series models and reducing MDASH costs by about 50%. The company also launched the Perception agent security system for continuous monitoring, automated patching and response to novel threats.

President Trump said Turkey has been a good ally and, responding to Israeli Prime Minister Netanyahu's opposition to a sale of F-35 fighters to Turkey, said no one tells him what he should sell to them.