South Korea's Lee vows 'strict accountability' for martial law perpetrators a year after Yoon’s ‘self-coup' attempt

South Korean President Lee Jae Myung marked the one-year anniversary of former president Yoon Suk Yeol's abrupt Dec. 3 martial law declaration, calling it a failed “self-coup” and pledging strict accountability as investigations and trials continue. Yoon faces insurrection charges (an offense carrying a potential death penalty), prosecutors have sought a 15-year term for former PM Han Duck-soo, and senior security officials including the defence minister and ex-intelligence chief have been arrested; the order was overturned within hours by the National Assembly and the constitutional process that followed included impeachments and court decisions. The political and legal uncertainty underscores elevated sovereign and political risk for South Korea, with implications for Korean equities, the won, and regional investor sentiment.

Analysis

Market structure: Political shock concentrates downside on South Korea domestic cyclicals (banks, consumer, autos) and raises bid for defense, cybersecurity, and legal-service providers. Expect outsized flows out of KRW-denominated assets — an initial 3–7% KRW depreciation and a 5–15% KOSPI gap-down are plausible in the first 5–10 trading days, lifting regional safe-haven flows into USTs and gold.

Risk assessment: Tail scenarios include escalation to broader military confrontation or capital controls (low probability <10% but high impact—equity drawdowns >30%, sovereign spread widening +200–400bps). Immediate (days) volatility and liquidity stress; short-term (weeks–months) policy and legal crackdowns; long-term (quarters–years) implications for FDI, supply-chain re-shoring, and defense budgets.

Trade implications: Favor tactical longs in defense/aerospace (ITA or LMT) and tactical shorts/put protection on South Korea exposure (EWY, SSNLF). Use FX to hedge or express risk: long USDKRW via forwards or UUP as a proxy. Size as event-driven: small, liquid positions (1–4% portfolio) with explicit stop-losses tied to KRW moves or KOSPI stabilization.

Contrarian angles: Consensus may overprice permanent damage — historical parallels (Turkey 2016, Thailand episodes) show recovery in 3–12 months once institutions stabilize. Risk of policy intervention (capital controls, emergency liquidity) could blunt short positions; size and option structures to limit tail losses and capture mispricings on knee-jerk sell-offs.

Key Decisions for Investors

• Establish a 2–3% portfolio long in ITA (Aerospace & Defense ETF) or 1–2% in LMT within 1–3 months to capture a likely 10–20% upside over 12 months as regional defence budgets rise; set a stop-loss at -8% and take-profit at +20%.
• Buy 3-month EWY puts (or construct a 7% OTM put spread) sized at 2–3% portfolio notional to protect Korea equity exposure; unwind if EWY recovers 5% sustained over 3 trading days or after 90 days. Target payoff if KOSPI falls 10–25%.
• Implement a 1–2% notional long USDKRW exposure (spot/forward or UUP proxy) to hedge expected KRW depreciation of 3–7% over 30–60 days; cut if KRW strengthens >2% from entry. Use forwards if managing carry costs.
• Trim South Korea equity exposure by ~30% of current weight over next 2 weeks (sell EWY or Korean ADRs like SSNLF) and redeploy into 3–10 year USTs (IEF) or TLT for 3–6 months if KTB yield spread widens >50bps.