A series of developments that reshaped the regional security landscape in 2024 subjected the “Axis of Resistance” – one of the central pillars of Iran’s national security strategy – to unprecedented strain. Within this broader transformation, Hezbollah’s place in Iran’s defense and deterrence architecture has been redefined by three interrelated developments: the organization’s severe military losses, Syria’s geopolitical transformation, and the strategic pressures generated by direct confrontation between Iran and Israel. This process of reassessment reached a critical juncture on 7 June 2026, when Iran launched direct strikes against Israel in response to its continuing aggression against Lebanon.

The emerging picture suggests that Tehran’s Hezbollah policy is increasingly shaped by two competing strategic imperatives. On the one hand, Hezbollah remains indispensable to Iran’s regional deterrence posture and broader influence in the Levant. On the other hand, the costs and vulnerabilities associated with maintaining that relationship have increased substantially. As a result, Iran’s Hezbollah strategy is increasingly caught between reliance and restraint.

Iran’s forward defense doctrine was designed to keep the Israeli threat at a distance from Iranian territory by relying on Hezbollah as a forward deterrent and buffer force. The doctrine rested on a strategic logic that sought to deter Israel not primarily through Iran’s own conventional military capabilities, but through a network of allied non-state actors. Yet a series of developments beginning in 2024 fundamentally undermined the assumptions on which this approach was built.

Israel’s sustained campaign against Hezbollah severely degraded the organization’s military capabilities, while the elimination of numerous senior figures – not least Hassan Nasrallah – disrupted its command structure. The intelligence failures exposed during this period not only weakened Hezbollah institutionally but also raised difficult questions in Tehran regarding operational security and coordination. More importantly, Israel’s direct strikes on Iranian territory in October 2024 challenged the central assumption underlying the forward defense doctrine: despite the existence of proxy networks, Iran itself remained vulnerable to direct attack. The fall of the Assad regime and Syria’s subsequent geopolitical transformation further compounded these challenges by severing the strategic corridor that had linked Iran and Hezbollah for decades, thereby weakening the logistical foundations of their partnership and complicating Tehran’s ability to sustain the organization.

The Revised Doctrine

These strategic setbacks made a fundamental revision of Iran’s forward defense doctrine increasingly necessary. In its revised form, the doctrine is no longer primarily designed to prevent Israeli strikes from reaching Iranian territory. Rather, it seeks to employ Hezbollah as a second-front actor capable of imposing attritional costs on Israel in an environment where direct attacks on Iran are now considered a realistic possibility. Within this framework, Hezbollah functions as a strategic instrument intended to divide Israel’s attention and military resources, thereby reducing the pressure that would otherwise fall directly on Iran. Implicit in this shift is an acknowledgement that Tehran can no longer rely exclusively on forward defense and must place greater emphasis on its own deterrence and self-defense capabilities.

The twelve-day conflict of 2025 provided an initial test of this evolving approach. Hezbollah remained outside the confrontation, and Iran relied primarily on its own military capabilities to establish deterrence. In 2026, however, the picture changed. Hezbollah’s entry into the conflict amid combined Israeli and U.S. military pressure largely fulfilled the role envisaged for it within the revised doctrine by forcing Israel to contend with an additional front and thereby dispersing part of its military focus. Following the ceasefire, Tehran went a step further by treating the preservation of Hezbollah’s organizational structure and military capabilities as a key condition in the negotiating process. In doing so, it effectively reaffirmed Hezbollah’s continuing place within Iran’s broader deterrence architecture.

Between Deterrence and Vulnerability

Israel’s strikes against Hezbollah on 7 June 2026, Iran’s retaliatory missile attack, and the subsequent Israeli strikes on Iranian territory together revealed the central contradiction at the heart of Tehran's Hezbollah policy. The very relationship that strengthens Iran’s deterrence posture also increases its exposure to direct confrontation with Israel.

On one side of the equation are the costs of continued engagement. Iran’s close association with Hezbollah generates growing political backlash in Lebanon at a time when pressure for the organization's disarmament and integration into state institutions is increasing. More importantly, Hezbollah's role within Iran’s deterrence architecture has made Tehran increasingly vulnerable to direct Israeli retaliation. As the events of 7 June demonstrated, efforts to preserve Hezbollah can themselves become a source of risk for Iran's own security.

On the other side are the costs of disengagement. From Tehran’s perspective, Hezbollah remains a critical component of its regional deterrence posture. Were the organization to be disarmed or substantially weakened, Iran would lose the second-front capability that remains central to its strategy of imposing costs on Israel during periods of crisis. Beyond the military dimension, Hezbollah also occupies a symbolic place within Iran's regional project. Abandoning the organization would be interpreted not only as a strategic retreat but also as a weakening of Iran's claim to leadership within the broader resistance camp.

These competing pressures have generated an active debate within Iran’s security establishment. One camp argues that the lessons of 2024 require a shift away from heavy reliance on proxy actors and toward greater investment in Iran's own conventional military capabilities. The opposing view maintains that Hezbollah remains indispensable both as a deterrent asset and as a pillar of Iran's regional identity and influence.

The result is a persistent strategic ambiguity. Moving closer to Hezbollah strengthens deterrence but increases vulnerability. Distancing Iran from Hezbollah reduces immediate security risks but narrows Tehran's regional reach and influence. For now, Iran appears unwilling to fully embrace either option. The future of its Hezbollah policy will depend on how this tension is ultimately resolved within the country's political and security institutions.