Iran and the Caucasus: The Zangezur Corridor at the Heart of Regional Rivalry

The Zangezur corridor is a proposed transport route that would connect Azerbaijan's mainland with its exclave, the Nakhchivan Autonomous Republic, by passing through Armenia's Syunik Province. Wikipedia notes that the concept emerged after the 2020 Nagorno-Karabakh War and has been actively promoted by Azerbaijan and Turkey. Geopolitical Monitor frames it as a potentially transformative trade link in the South Caucasus, while TRT World Research Centre describes it as a strip of land reshaping the region's geopolitics.

For Iran, the corridor carries existential strategic weight. A direct Azerbaijani land link through southern Armenia would effectively sever Iran's overland border with Armenia - its only direct access to a non-Turkic, non-hostile neighbor in the region. RFE/RL reports that the 43-kilometer corridor has stirred deep unease in Tehran, particularly after proposals for American management of the route surfaced, which analysts say deepened existing fault lines in the South Caucasus.

Iran's opposition to the corridor has been stated at the highest levels of government. According to IRAM Center, Supreme Leader Ali Khamenei explicitly designated the opening of the Zangezur corridor as a strategic red line for the Islamic Republic. This position reflects Iran's concern that a new corridor under Azerbaijani or Turkish control would diminish its regional leverage and potentially allow Western or Israeli influence to consolidate on its northern border.

Yet Iran's stance is not monolithic. The Jerusalem Post observes that Tehran's position has shifted from sharp opposition toward cautious diplomacy, reflecting both domestic political realities and a recognition that outright confrontation carries significant costs. This internal tension - between hardliners who view the corridor as an existential threat and pragmatists who prefer engagement - shapes the unpredictability of Iran's regional behavior.

The broader Iran-Azerbaijan relationship has been marked by cycles of escalation and de-escalation. The NATO Association of Canada traces the roots of the rivalry to competing regional interests that intensified after the 2020 war, while Armenian Weekly reports that analysts consider tensions between the two countries to have reached a critical point, with numerous Iranian and regional media outlets amplifying the dispute.

A significant escalatory moment came when Gulf International Forum reported an Iranian drone strike on Nakhchivan, signaling that wider regional conflicts were spilling into the South Caucasus and opening what analysts described as a new front with serious implications for stability. CEPA assessed that while tension had spilled over into the Caucasus, the balance of power does not favor Iran in a direct confrontation with Azerbaijan. Despite this, The National Interest notes that both sides have periodically stepped back from the brink, suggesting that neither party currently seeks full-scale conflict.

A key driver of Iranian anxiety is the warming relationship between Azerbaijan and Israel. The Washington Institute highlights that Iran and Russia are closely monitoring Israel's deepening ties with Baku, as well as the possibility of shifting control over regional corridors. From Tehran's perspective, an Israeli security or intelligence footprint on its northern border - facilitated by Azerbaijani territory - represents a direct threat.

The prospect of American involvement in managing the Zangezur corridor adds another layer of concern. RFE/RL reports that US management proposals have stirred unease in Iran and deepened fault lines across the South Caucasus, reinforcing Tehran's perception that the corridor project is not merely a transport initiative but a geopolitical instrument aimed at reducing its regional influence.