Context

• The global war on terror, launched by the United States after September 11, 2001, sought to eliminate terrorism and contain threats to American interests.
• However, its interventions in Afghanistan and Iraq produced unintended consequences that strengthened Iran.
• By removing hostile regimes, creating political vacuums, and intensifying sectarian conflicts, U.S. actions enabled Tehran to emerge as a powerful regional actor.
• Iran’s rise demonstrates how military intervention can generate outcomes contrary to its original objectives.

The Removal of Iran’s Strategic Rivals

• Before 2001, Iran faced strategic pressure from two hostile neighbours: the Taliban in Afghanistan and Saddam Hussein’s Iraq.
• The U.S. invasions of Afghanistan in 2001 and Iraq in 2003 removed these governments, eliminating Iran’s most dangerous regional adversaries.
• In Iraq, the overthrow of Saddam’s Sunni-dominated regime enabled the emergence of a Shia-led political order with strong connections to Tehran.
• Iran subsequently developed substantial influence over Iraqi political institutions, security organisations, and armed militias.
• Iraq gradually shifted from a hostile neighbour to a strategic partner, significantly improving Iran’s regional position.

Sectarianism and the Expansion of Proxy Warfare

• The Shia-Sunni Divide
  • The invasions of Afghanistan and Iraq destabilised existing political structures and intensified Shia-Sunni sectarian tensions.
  • The weakening of central authority encouraged religious identity-based mobilisation and armed conflict.
  • In Iraq, Sunni insurgent groups and Shia militias competed for influence, while regional powers supported opposing factions.
  • Iran strengthened Shia militias, whereas Saudi Arabia and other regional actors supported Sunni political and militant forces.
  • This proxy warfare increased Tehran’s influence and undermined the objective of isolating Iran.
• Iran’s Role in Counter-Terrorism
  • The emergence of ISIS paradoxically strengthened Iran’s regional position.
  • Tehran became a crucial military supporter of the Iraqi government, deploying advisers and coordinating Shia militias through the Quds Force of the Islamic Revolutionary Guard Corps.
  • Iran’s participation in the anti-ISIS campaign provided strategic legitimacy for its military presence in Iraq and Syria.
  • Although the United States and Iran briefly shared an interest in defeating ISIS, meaningful cooperation failed to emerge.
  • The U.S. designation of Iran as part of the Axis of Evil in 2002 reflected continuing hostility and prevented sustained dialogue.

The Axis of Resistance and Forward Defence

• Iran’s regional strategy developed around the Axis of Resistance, a network of political, military, and social organisations extending across Iran, Iraq, Syria, Lebanon, and Palestine.
• Its major members include Hezbollah, Hamas, the Houthis, and Shia militias in Iraq.
• These groups provide Iran with strategic depth and enable it to exert influence beyond its national borders.

The Islamic Revolutionary Guard Corps and Asymmetric Power

• Iran’s military strategy has focused heavily on the Islamic Revolutionary Guard Corps (IRGC), particularly its Quds Force.
• The IRGC controls important strategic assets and coordinates Iran’s regional partnerships.
• Unlike conventional military forces, the IRGC specialises in asymmetric warfare, using military advisers, intelligence, missile capabilities, and allied armed groups to project Iranian power.
• This strategy allows Iran to challenge the United States and Israel without matching their conventional military superiority.
• Proxy networks have therefore become a central pillar of Iranian defence policy.

Power Vacuums after 2011

• The U.S. withdrawal from Iraq and the Arab Spring in 2011 created political and security vacuums.
• Iran was well positioned to exploit these developments because it already possessed established networks of allies and military influence.
• In Iraq, Iranian-backed forces became important actors in the fight against ISIS.
• In Syria, Tehran intervened to defend Bashar al-Assad’s government, protecting its major state ally and preserving access to Hezbollah in Lebanon.
• The prolonged Forever Wars consumed American resources and attention, allowing Iran to consolidate its influence.
• Its ability to operate through local partners reduced the costs of direct intervention while increasing strategic reach.

The Transformation of Iran into a Regional Power

• The removal of hostile regimes, collapse of political institutions, and rise of sectarian conflicts enabled Tehran to expand its influence across West Asia.
• Iran’s regional power rests on strategic depth, proxy warfare, political alliances, military networks, and nationalism.
• The IRGC coordinates regional operations, while allied governments and armed groups provide buffers against external threats.
• This transformation illustrates the limitations of strategies based exclusively on military containment.
• By attempting to reshape West Asia through intervention, the United States unintentionally created conditions for Iran’s rise.

Conclusion

• Although the United States sought to eliminate terrorism and contain Iran, its interventions removed Iran’s strategic rivals, destabilised neighbouring countries, and enabled Tehran to expand its influence.
• Iran capitalised on these developments through the Axis of Resistance, the IRGC, and an extensive network of regional alliances.
• Iran’s present capacity to resist pressure from the United States and Israel reflects the cumulative advantages it gained during the past two decades.
• Its rise demonstrates that military interventions can generate unintended strategic consequences, particularly when they disrupt regional balances without establishing durable political stability.