On 8 August 2025, Azerbaijani President Ilham Aliyev and Armenian Prime Minister Nikol Pashinyan initialed the Agreement on Peace and the Establishment of Interstate Relations between Azerbaijan and Armenia in Washington, under the auspices of U.S. President Donald Trump. The accord has the potential to recalibrate the strategic landscape of the South Caucasus. Beyond its provisions for bilateral cooperation, most notably in transit and transportation, it carries significant implications for Iran, touching on the security of its northwestern frontier, its prospects for integration into Eurasian connectivity corridors, and its broader capacity for regional power projection.

In its initial response to the agreement, Tehran underscored two guiding principles: firm support for the peace process and categorical opposition to any enduring security or political role for extra-regional actors in the South Caucasus. Following his return from Washington, Prime Minister Pashinyan launched a round of intensive telephone diplomacy with key leaders, including Russian President Vladimir Putin and Turkish President Recep Tayyip Erdoğan, addressing both the regional balance and the implications of the accord. As part of this outreach, on 11 August he also held talks with Iranian President Masoud Pezeshkian, focusing specifically on recent developments surrounding the Zangezur Corridor.

President Pezeshkian emphasized that the project must proceed strictly within the bounds of Armenia’s sovereignty, devoid of any military or security dimensions, and with vigilance regarding potential U.S. involvement. For his part, Prime Minister Pashinyan assured that Yerevan would not endorse any agreement that disregards Iran’s interests or sensitivities. He stressed the strategic weight of bilateral relations and reaffirmed that major decisions would be pursued through mutual consultation. This direct exchange signals Armenia’s attempt to chart a balanced course and avoid friction with Iran while safeguarding its own national interests. Nonetheless, the prospect of American companies participating in the construction or operation of the corridor remains a strategic red line for Tehran.

Tehran perceives the Zangezur Corridor as far more than a technical transportation project. Within the broader dynamics of “corridor competition,” Iranian policymakers view it as a geopolitical instrument capable of sidelining Iran in emerging Eurasian trade routes, while simultaneously advancing strategic threats: the potential encroachment of NATO and U.S. influence along its northern frontier, and the expansion of Israel’s intelligence and logistical reach into the South Caucasus.

In Armenia, however, the domestic debate has centered less on geopolitics than on semantics, specifically the implications of the term “corridor” and the notion of granting “special status.” Seeking to frame the U.S.-brokered agreement as a step toward regional peace, Yerevan has deliberately shifted its language. By favoring the designation “transportation route” over “corridor,” the Armenian government aims to reassure Tehran that its sensitivities are respected and to underscore the strategic weight it attaches to bilateral relations with Iran.

Opposition parties and segments of civil society, by contrast, interpret the corridor project as a conduit for external intervention that risks eroding Armenia’s sovereignty. From this perspective, Tehran’s warnings are seen as both credible and warranted. Academic and media circles adopting a more measured stance caution that while Armenia should preserve a close and transparent dialogue with Iran, engagement in this and similar initiatives could simultaneously serve to diversify the country’s regional linkages and yield long-term geo-economic dividends.

Reactions from Iran

In the aftermath of the 12-day conflict with Israel and the United States, Tehran has adopted a more measured and constructive register, particularly in its rhetoric toward neighboring states. While Armenia’s most recent steps generated unease in Iran, the response of senior officials has been distinctly more restrained than in earlier years. By contrast, commentary from semi-official actors and affiliated media outlets has been considerably sharper.

Government and Diplomatic Messaging

The official line has combined guarded support with explicit caveats. The Iranian Ministry of Foreign Affairs welcomed the Armenia-Azerbaijan agreement for its potential to advance the peace process, while underscoring that any permanent extra-regional military or political presence in the South Caucasus would jeopardize stability. The statement stressed that Tehran does not oppose the principle of opening new transportation routes, provided that such initiatives respect sovereignty and territorial integrity and exclude outside interference.

President Pezeshkian echoed this cautious approach and noted that assurances had been given to Iran that the corridor would remain under Armenian sovereignty and that Iran’s continental transit links would not be severed. Yet he flagged the possible participation of American companies in constructing and operating the route as the single element of concern.

Security Establishment and Hardline Responses

In contrast, security figures and semi-official voices have articulated far harsher assessments. Ali Akbar Velayati, senior foreign policy adviser to the Supreme Leader, warned that the corridor would alter the region’s geopolitical structure, risk Armenia’s partition, and serve as a U.S. vehicle of influence. He predicted the initiative would become “the graveyard of Trump’s mercenaries” and declared that Iran would block its realization, either in concert with Russia or independently.

Similarly, IRGC Political Deputy Commander Yadollah Javani charged Presidents Aliyev and Pashinyan with inviting the U.S., the United Kingdom, and NATO into the South Caucasus, thereby internationalizing what should remain a regional matter. He argued the move undermined not only Iranian and Russian interests but also those of China and India.

Reinforcing this line, Ebrahim Rezaei, spokesperson for the parliament’s National Security and Foreign Policy Commission, warned on social media that Iran would not permit any alteration of its borders “at any cost.” Such rhetoric highlights the divergence between Iran’s official diplomatic posture and the threat perceptions emanating from its security institutions, reflecting the fragmentation of power centers in Tehran.

Media and Expert Analyses

Assessments in the Iranian press regarding the agreement diverge sharply along conservative and reformist lines. Conservative outlets frame the deal as a strategic gateway for U.S. and NATO entrenchment in the South Caucasus, warning that it would effectively turn Iran into a direct neighbor of Israel along its northwestern frontier. In this reading, the corridor is far more than a technical transportation link; it is a geopolitical redesign engineered by Washington in concert with NATO, Türkiye, and Azerbaijan. Such a project, aligned closely with Ankara’s strategic ambitions, is portrayed as one that would simultaneously expand Israel’s logistical depth and marginalize Iran, Russia, and China from emergent regional trade networks.

However, reformist commentary offers a different emphasis. While acknowledging that the route remains under Armenian sovereignty, reformist analysts stress that its implementation would effectively be driven by American companies, elevating Washington to the role of principal power broker in the South Caucasus. They caution that Iran would lose its transit leverage between Azerbaijan and Nakhchivan, and even if its commercial losses remained limited, the true strategic risk lies in the permanent establishment of a U.S. footprint along the roughly 40-kilometer Iran–Armenia border.

Policy Choices Ahead

The opening of the Zangezur Corridor has been explicitly designated a strategic red line by Supreme Leader Ali Khamenei. From the outset, Tehran has sought to convey this position directly to Yerevan, underscoring both the sensitivity and strategic weight of the issue. For its part, the Pashinyan government appears intent on leveraging domestic and international opportunities to transform Armenia into a regional trade hub. Should stabilization take hold, the dividends would be mutual, including for Iran. Expanded trade could elevate prosperity in Iran’s northwest, while the removal of the recurring question of “which side Iran supports” in regional disputes would afford Tehran diplomatic relief and greater room for maneuver.

A cooperative framework involving Azerbaijan, Armenia, and Georgia along with Türkiye, Iran, and Russia could inject much-needed economic vitality into the South Caucasus. Such an arrangement would particularly benefit eastern Türkiye and borderland communities along northern Iran. To maximize these gains, the parties must resist ideological framings and instead emphasize the tangible dividends of prosperity, connectivity, and shared stability.

Ultimately, the deepening of relations anchored in mutual interests and practical interdependence can serve as a foundation not only for regional economic resilience but also for strengthening Iran’s own national security. For Tehran, the Zangezur Corridor thus represents less a binary choice between obstruction and acquiescence than a test of its ability to align strategic red lines with policy innovation.