What If the U.S. “Wins” In Iran? | The High Top

Center for Strategic & International Studies (CSIS)
Center for Strategic & International Studies (CSIS)Mar 27, 2026

Why It Matters

U.S. decisions on Iran influence global security, energy supply chains, and the strategic balance of the Middle East.

Key Takeaways

  • Regime change could trigger power vacuum
  • Iran may accelerate clandestine nuclear program
  • Gulf stability hinges on post‑conflict governance
  • U.S. involvement risks long‑term regional backlash
  • Energy markets react to geopolitical uncertainty

Pulse Analysis

The prospect of a U.S. "win" in Iran forces policymakers to confront a paradox: removing a hostile regime may create a vacuum that rivals or extremist groups could fill. Historical precedents, from Iraq to Libya, show that without a clear succession plan, neighboring states often scramble for influence, destabilizing trade routes and threatening the security of oil‑rich waters. Analysts therefore stress that any military success must be paired with robust diplomatic frameworks to guide a credible, inclusive transition.

A central concern is Tehran’s potential acceleration of a covert nuclear weapons program. Even if overt nuclear ambitions are curbed, pressure from sanctions and isolation can drive Iran underground, increasing secrecy and reducing transparency for international watchdogs. This hidden pathway raises proliferation risks, as advanced enrichment technology could be diverted to regional proxies, amplifying the threat to U.S. allies and commercial shipping lanes. Consequently, intelligence agencies and non‑proliferation bodies must prioritize monitoring and diplomatic engagement to deter clandestine development.

Beyond security, the ripple effects on global energy markets are profound. Uncertainty in the Strait of Hormuz—through which roughly 20% of worldwide oil passes—can trigger price spikes and supply chain disruptions, affecting everything from gasoline to petrochemical industries. Investors and corporations watch geopolitical signals closely, adjusting hedging strategies and diversifying supply sources. In the long run, a stable, cooperative Iran could unlock new energy partnerships, while a destabilized region would sustain volatility, underscoring why nuanced, forward‑looking policy is essential for both national security and economic stability.

Original Description

What would victory over Iran actually look like? And could it make things worse?
Jon B. Alterman (Brzezinski Chair in Global Security and Geostrategy) and Joseph Majkut (Director of the Energy Security and Climate Change Program) explore the uncertain outcomes of regime change in Iran. Could a new government emerge that stabilizes the Gulf? Or could pressure push Iran to pursue nuclear weapons secretly, leaving the region in a far more dangerous place a decade from now? The real question may not be how the conflict ends today, but whether the region is safer 10 years from now.

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