Iran’s International Impact: Why Europe Is Tightening Diplomatic and Security Oversight

Iran’s relations with Europe are entering a more difficult phase. A diplomatic row between Tehran and Paris has escalated into the expulsion of Iranian embassy staff, even as the European Union moves to extend sanctions over Iran’s security activity, human rights record and threats to freedom of navigation. But uncertainty about the Strait of Hormuz continues to weigh on global shipping and energy markets. Cumulatively, these developments highlight why Iran should not be viewed only through the lens of Middle Eastern politics. Its behavior is having a growing impact on Europe’s security, diplomacy, trade and energy stability.

France-Iran dispute puts diplomatic activity under sharper scrutiny

France was the latest country to up the diplomatic ante. In a statement on 19 August, the French Foreign Minister, Jean-Noël Barrot, declared that two employees of Iran’s embassy in France had been declared persona non grata under Article 9 of the 1961 Vienna Convention on Diplomatic Relations. The decision was made after an alleged attack by Iranian security services against two French embassy employees in Iran on July 19, France said. Paris labeled it a serious violation of international law and diplomatic protections. Iran denies wrongdoing and says French personnel engaged in interference, according to the French government’s account.

The legal point is important.  Diplomatic immunity shields accredited diplomats from certain types of prosecution and interference by the host state, but does not grant diplomats carte blanche to engage in activities outside their official functions. A receiving state may under Article 9 of the Vienna Convention declare a diplomat persona non grata without explanation. Now France has resorted to that mechanism against two employees of the Iranian embassy.

Europe is treating Iranian security concerns as a wider problem

France is not doing so in a vacuum. In June, France, Germany, Belgium, the United Kingdom, Canada and the United States were among 24 countries that issued a joint statement condemning what they called lethal plotting and other hostile activities associated with Iranian security services. Authorities said Iran’s Islamic Revolutionary Guard Corps Intelligence Organization, Quds Force and Ministry of Intelligence and Security had been connected to threats against dissidents, journalists, Jewish communities and Israeli interests outside of Iran. The statement also referred to alleged cooperation between Iranian security services and criminal networks. These remain government allegations and should not be assumed to be proven in every case.

It’s not just one investigation that’s significant. European governments are growing concerned that Iranian operations abroad pose a threat to national security including surveillance, intimidation, attempted attacks and the use of criminal intermediaries. The UK has done similar evaluations. In July, London sanctioned an organization called the Islamic Movement of Companions of the Right, or HAYI, after it publicly claimed responsibility for attacks at sites in the UK. Since the start of 2022 the British government said it has disrupted more than 20 Iran-backed plots and has more than 550 sanctions designations against Iranian individuals and organizations.

Germany and Belgium face the same security dilemma

Germany has diplomatic relations with Iran but Berlin says they have become highly strained. Iran’s human-rights record, nuclear program and regional policy are among the major concerns pointed out by its foreign ministry. Germany has backed EU sanctions and labeled Iran’s Revolutionary Guard Corps a terrorist organization. Belgium also takes part in the wider European security response. In June, Brussels signed the statement of 24 countries condemning alleged Iranian state threats and attacks outside the Middle East. Belgium has also warned its citizens about the risk of arbitrary detention in Iran, a reminder of how diplomatic tensions can affect European citizens directly.

This creates a difficult balance for European governments: diplomatic channels remain useful for negotiations and crisis management, but embassies and diplomatic personnel are also subject to increased scrutiny when national-security concerns arise.

EU sanctions are moving beyond traditional Iran policy

The European Union has also expanded its legal response.

In May, the EU extended its sanctions regime to cover individuals and entities involved in actions that threaten freedom of navigation. The Council said that interference with vessels transiting the Strait of Hormuz may violate established rights of transit and innocent passage under international law.

In June, the EU imposed sanctions on the Hormozgan Provincial Command of the IRGC Navy, saying it managed parts of the Strait of Hormuz and made demands on ships. Brussels added six people in July over serious human-rights abuses, including an Iranian hacker accused of cyberattacks against domestic opponents and foreign institutions.

The message is clear: Europe is increasingly connecting Iran’s domestic security policies, overseas operations, military support and maritime activities within a single broader sanctions strategy.

Hormuz shows how Iran affects the global economy

The biggest international economic concern at the moment is shipping via the Strait of Hormuz. Reuters on August 27 stated that the number of commodity vessels passing through the strait had increased slightly, going from eight to ten, but was still lower than the recent 10-day average of 15. The shipping companies are still keeping an eye on the talks between Iran and Oman concerning the management of the waterway. The oil markets have reacted to each indication of diplomatic progress. On the same day, Reuters stated that the price of Brent crude dropped to approximately $86.48 per barrel as it became more likely that the talks would lead to relaxations of the restrictions on the strategic waterway. However, the market is still cautious since a lasting agreement has not been reached.

The implications for Europe go well beyond rising petrol prices; increased costs of oil and gas can lead to higher transportation costs, greater manufacturing costs, higher electricity prices and larger household energy bills. The European LNG markets have already been under pressure; according to the Financial Times, European LNG prices have recently hit their highest level since January 2023, the reason being the reduced shipping through Hormuz which has caused supply concerns.

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Why this matters beyond the Middle East

The issue concerning Iran is gradually turning into one that concerns European sovereignty and economic security. Diplomatic disagreements are important since attacks or claims of interference by foreign diplomats can weaken the rules which enable international diplomacy to operate. The security inquiries are important since alleged overseas activities can reveal weaknesses in the European communities and institutions. And the Hormuz crisis is important because interference with one maritime chokepoint can rapidly impact global energy prices and supply chains.

The problem which Europe now faces is not merely whether it should take a harder line or a softer one towards Iran, but rather how it can keep its diplomatic channels open while at the same time respecting diplomatic privileges, national sovereignty and international law. In the months ahead policymakers will probably need to increase their intelligence cooperation, enforce sanctions in a coordinated manner and at the same time ensure the careful protection of diplomatic facilities while still allowing room for negotiations which could ease tensions concerning Iran and lead to more dependable international trade routes.

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