Asian Markets Open Sharply Lower: KOSPI Falls 3%, Nikkei Down 1% as US-Iran War Escalates

The Quick Take

• Asian equity markets opened sharply lower with South Korea's KOSPI falling 3% and Japan's Nikkei 225 declining 1% on US-Iran war escalation.
• The broader Japanese Topix advanced 0.43%, showing divergent behavior within Japanese equities as defensive and export sectors reacted differently.
• The geopolitical risk premium is back in global markets, driven by second-day US military strikes on Iranian targets.

Synthesized from 1 source.

Mint Markets reports that Asian equity markets opened in significant risk-off territory on Monday as US military strikes on Iran entered a second day, straining the ceasefire framework. South Korea's KOSPI fell 3% at the open — a sharp single-session move that reflects South Korea's particular sensitivity to Middle East escalation given its heavy energy import dependence and significant semiconductor export exposure to global demand uncertainty. Japan's Nikkei 225 was off 1% while the Topix advanced modestly, suggesting that large defensive and export-oriented names within Japan's broader market held better than tech-heavy Nikkei components.

The market implications are acute for the full Asia-Pacific region. A sustained US-Iran military escalation creates three concurrent risk transmission channels: oil price spikes compressing energy-import-heavy economies like South Korea, India, and Japan; risk appetite suppression reducing FII inflows to emerging market equities; and shipping disruption risk in the Strait of Hormuz, through which approximately 20% of global oil transit passes. For Indian equities, the dual hit of oil price risk and reduced global risk appetite represents a significant near-term headwind to the Nifty and Sensex recovery.

Investors should monitor the US-Iran ceasefire status and whether day-three strikes continue — the escalation trajectory will determine whether Asia's risk-off open stabilizes or deepens through the trading session. The macro variable is whether Iran retaliates with Strait of Hormuz disruption, which would be the most severe market-negative outcome, driving Brent crude above $90 and triggering global equity de-risking. Watch also for South Korean won and Japanese yen movements — safe-haven yen inflows and KRW weakness would be real-time escalation barometers.