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The lead: The outbreak of hostilities in Iran, ignited on 18 May 2026, has sent shockwaves through global bond markets, prompting fears of a new debt crisis that could echo the 2022 sovereign debt shock.Escalating Conflict in Iran and Its Immediate Market SignalsThe confrontation began after a series of cross‑border strikes between Iranian forces and regional adversaries, quickly drawing in neighboring states and raising the specter of a broader Middle‑East war. Within hours, investors priced in heightened geopolitical risk, pushing EM (Emerging Market) bond yields up by 150 basis points and triggering a sell‑off in regional currencies.Key dates: 18 May 2026 – conflict erupts; 19 May 2026 – EM bond spreads widen sharply.Immediate market reaction: U.S. Treasury 10‑year yield rose to 4.75%; the MSCI Emerging Markets Index fell 4%.Quantifying the Financial Exposure: Debt Figures and Market MovesAnalysts have mapped the debt exposure that could be destabilized by the conflict:Iran's external debt: approximately $1.2 trillion, with $450 billion in Euro‑dollar bonds due in the next 12 months.Regional debt at risk: $3.5 trillion across Iraq, Syria, and Lebanon, much of it denominated in USD.Capital flight: Emerging market equity outflows reached $120 billion in the first 48 hours.Risk premiums on sovereign bonds of neighboring states widened by 200–300 bps, while credit default swap (CDS) spreads for Iran spiked to 1,200 bps, the highest level since 2022.Ripple Effects on Emerging Economies and Global Credit ConditionsThe shock is not confined to the Middle East. Higher risk premiums are spilling over to other vulnerable economies, pressuring global credit conditions:Latin America: Argentine and Colombian bond yields rose 80 bps as investors reassess contagion risk.Asia: Indonesia and the Philippines saw their sovereign CDS spreads increase by 120 bps.Policy response: The International Monetary Fund (IMF) warned of “tightening global financing conditions” and urged member states to bolster foreign‑exchange reserves.Scenarios for the Next Debt Shock and Policy ResponsesExperts outline three plausible pathways:Containment: If diplomatic channels de‑escalate the conflict within three months, markets could stabilize, and debt servicing pressures would ease.Prolonged conflict: A six‑month stalemate could force Iran and its allies into debt restructuring, triggering a wave of defaults across the region.Escalation to wider war: Involvement of major powers could trigger a sharp spike in global risk aversion, pushing emerging market borrowing costs above 10 % and reviving a systemic debt shock.Policymakers are urged to prepare contingency financing, coordinate with the G20 on liquidity provisions, and consider temporary debt service relief for the most exposed economies.