Main Points
· The EU’s diplomatic influence on the Iran file has diminished progressively since the collapse of the JCPOA in 2018. During the 2026 Iran war, the bloc was neither consulted before the strikes nor involved in the mediation efforts that followed.
· The economic impact on Europe has been severe: the IMF and ECB have both cut eurozone growth forecasts, the European Commission has warned of stagflation, and the continent faces its most acute energy-supply shock since 2022.
· The diplomatic space around the conflict has been shaped by actors with direct exposure, Pakistan, China, Turkey, and the Gulf states, operating outside the multilateral frameworks that Europe helped design.
For a brief period in the 2010s, the European Union occupied a rare position of genuine diplomatic leadership on one of the most sensitive security files in the Middle East. The Joint Comprehensive Plan of Action on Iran’s nuclear programme, concluded in 2015 after more than a decade of European-led negotiations, demonstrated that Brussels could coordinate sustained multilateral diplomacy and produce results. In fact the JCPOA was one of the few tangible successes of EU foreign policy and one of the rare cases where the bloc played a genuinely leading role.
That position has not survived the following decade. As of April 2026, Europe finds itself contending with the economic fallout of a major Middle Eastern war while having had little influence over either its outbreak or the diplomatic efforts to contain it. How did this happen?
A Gradual Erosion
The erosion of European influence on Iran began with the U.S. withdrawal from the JCPOA in 2018. European governments attempted to salvage the agreement through INSTEX, a financial mechanism intended to facilitate trade with Iran outside the reach of American sanctions. The mechanism proved largely ineffective. Tehran increasingly viewed European engagement as insufficient, and diplomatic channels between the two sides gradually thinned.
The escalatory cycle that followed October 7, 2023, deepened the problem. As the Israel-Gaza war expanded into Lebanon, then into direct Israeli-Iranian exchanges in 2024 and the Twelve-Day War of June 2025, Europe’s response was, as the Council on Foreign Relations observed, consistently reactive, internally divided, and slow to materialise. When the U.S. and Israel launched Operation Epic Fury against Iran on
February 28, 2026, these fractures became fully visible. Spain opposed the strikes and clashed with Washington. Germany’s chancellor suggested that criticising U.S. conduct was beside the point. France invoked international law but proposed no concrete course of action. In fact, the EU Institute for Security Studies characterised the pattern as one where Europe retains significant institutional capacity on Iran but lacks the political unity and strategic independence from Washington needed to translate that capacity into actual influence.
The Economic Toll
Europe’s limited diplomatic role has not shielded it from the war’s consequences. The International Monetary Fund and the European Central Bank have both cut their 2026 eurozone growth forecasts, to 1.1 percent and 0.9 percent respectively down from prior estimates of 1.4 and 1.2 percent. Germany has halved its growth outlook for the year to 0.5 percent. Plus, the European Commission’s economy commissioner, Valdis Dombrovskis, warned that the EU faces a stagflationary shock: under the Commission’s adverse scenario, growth could slow by 0.6 percentage points while inflation rises by up to 1.5 points above previous forecasts.
The transmission channels are multiple. S&P Global’s March purchasing managers’ index for the eurozone fell to 50.5, barely above stagnation, while input costs reached a three-year high, what S&P Global’s chief economist described as “stagflation alarm bells”. Furthermore, Europe has roughly six weeks of jet-fuel reserves remaining, according to the International Energy Agency. Chemical and steel manufacturers across the EU have imposed surcharges of up to 30 percent to offset surging energy and feedstock costs. The structural bind is clear: Europe cannot disengage from the Middle East, because the region’s instability directly affects European energy security, industrial output, and household costs. But it currently lacks the tools, the cohesion, or the authority to shape the conflict’s trajectory.
A Different Kind of Diplomacy
While Europe has struggled to find an entry point, the diplomatic space around the conflict has been occupied by a different set of actors. Pakistan brokered a ceasefire between the U.S. and Iran in early April and hosted twenty-one hours of direct negotiations between U.S. Vice President JD Vance and Iranian Parliament Speaker Ghalibaf, the highest-level encounter between the two countries since 1979. Islamabad’s role was driven by its direct exposure to the conflict: a 900-kilometer border with Iran, energy dependence on the Strait of Hormuz, a restive Shia minority, and a mutual defence pact with Saudi Arabia that risked activation if the war escalated. Pakistan’s army chief, Field Marshal Asim Munir, maintained simultaneous channels to both the White House and Iran’s Revolutionary Guards, and brought China into the process through a joint five-point peace initiative.
Ultimately, the talks did not produce a lasting agreement, the ceasefire has since frayed, and the U.S. has imposed a naval blockade on Iranian ports. However, it’s worth noticing the format for European observers: crisis mediation carried out by states with immediate, tangible stakes in the outcome, coordinating with Turkey, Egypt, and Saudi Arabia through ad hoc channels rather than established institutional frameworks. It is completely another form of diplomacy, whose credibility derives from proximity and vulnerability rather than from the kind of institutional detachment that characterised Europe’s role during the JCPOA process.
The Question Ahead
Europe’s challenge going forward is not simply one of diplomatic prestige. The continent is absorbing real and measurable economic damage from a conflict it has no hand in managing. The multilateral formats that Europe helped design and lead for two decades, the E3+3, the Quartet, the Vienna process, have been progressively sidelined, and what is emerging in their place operates on terms that do not naturally favour European participation. For European and Eurasian actors with interests in the Middle East, the practical question is what form of engagement the EU can credibly offer in a diplomatic landscape increasingly shaped by regional actors with direct stakes in outcomes, and whether Europe can rebuild the independent positioning and internal coherence that once made it a serious interlocutor on the region’s most consequential files.
Bibliography
The JCPOA: European Parliament, https://www.europarl.europa.eu/cmsdata/122460/full-text-of-the-iran-nuclear-deal.pdf
Farnaz Alimehri, “The INSTEX Project: Why Did Europe’s Ambitious Financial Vehicle Fail and What Next?” Foreign Affairs Review, https://www.foreignaffairsreview.com/home/the-instex-project-why-did-europes-ambitious-financial-vehicle-fail-and-what-next
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Flavia Onwuelo
Bachelor student of Comparative European International Legal Studies at the University of Trento.