Europe Explores EU Article 42.7 as a Potential NATO Alternative

European leaders are seeking to clarify a rarely used collective defense clause in the European Union (EU) treaty, amid growing doubts about Washington's long-term commitment to NATO as relations with the United States suffer deep strains.

NATO, founded in 1949, is a military alliance between North America and Europe based on the principle that an attack on one member is considered an attack on all. However, years of tension between Washington under President Donald Trump and European allies have prompted European governments to focus more on their own defense capabilities.

This shift comes as Trump has repeatedly criticized NATO members over defense spending. He has also questioned the alliance's value, clashed with European leaders on Ukraine and Iran, and threatened to take Greenland from allied Denmark. Tensions escalated most recently after the U.S. and Israel began a war with Iran, with Trump accusing allies of not supporting Washington and branding NATO a 'paper tiger.'

Media reports indicate the Pentagon prepared a memo examining options to penalize allies perceived as not adequately supporting the Iran war. These options included reviewing the suspension of Spain—a critic of the war—from NATO and reconsidering U.S. stance on Britain's sovereignty claim over the Falkland Islands. NATO lacks a formal mechanism to expel a member, but this episode has cast doubt on the alliance's unity and revived questions about Europe defending itself without Washington.

At the heart of Europe's efforts to find alternative security arrangements outside NATO is Article 42.7 of the treaty establishing the European Union.

What is Article 42.7?

Article 42.7 of the Treaty on European Union is the bloc's collective defense clause. It stipulates that if an EU member state is the victim of armed aggression on its territory, other member states have an obligation to provide aid and assistance by all means in their power, in line with the United Nations Charter.

Compared to NATO's Article 5—which holds that an attack on one member is an attack on all, backed by joint planning, joint exercises, and U.S. military might—Article 42.7 lacks an integrated military command structure, standing defense plans, or permanent forces for automatic reaction, and the U.S. has no obligation to intervene. This makes it often seen as less reliable as a practical military guarantee, though it remains an important political commitment.

Who is calling for Europe to use Article 42.7?

Cyprus, an EU member but not a NATO member, is particularly keen to strengthen this clause after a drone attacked a British airbase on the island during last month's Iran war. Cypriot President Nikos Christodoulides said leaders agreed it was time to define how the clause would work in practice if triggered. He stated: 'We agreed last night that the European Commission will prepare a detailed plan on how we would respond in case a member state activates Article 42.7.'

French President Emmanuel Macron also stressed that the clause should be seen as a binding commitment rather than a symbolic gesture. He said: 'On Article 42, paragraph 7, it is not just empty words. For us, it is clear and leaves no room for interpretation or ambiguity.' European Council President Antonio Costa said the bloc is drafting a 'handbook' for the clause's use. EU foreign policy chief Kaja Kallas also argued Europe must boost defense efforts after Trump 'shook the foundations of transatlantic relations.'

Has the clause been invoked before?

The clause has been used only once before, when France invoked it after the 2015 Paris attacks claimed by ISIL (ISIS), which killed 130 people and wounded hundreds. After Article 42.7 was invoked, other EU countries shared intelligence to help French authorities clarify the plot leading to the attacks.

NATO's Article 5 has also been invoked only once—after the September 11, 2001 attacks in the U.S. However, NATO's support for the U.S. went beyond intelligence sharing. Allies contributed tens of thousands of troops to the U.S.-led war in Afghanistan. The campaigns lasted two decades, and more than 46,000 Afghan civilians, 2,461 U.S. personnel, and about 1,160 non-U.S. coalition soldiers were killed, according to Brown University's Costs of War project.

Can countries be expelled from or leave NATO?

The debate on European defense occurs amid a series of disputes within NATO. Reports of U.S. officials considering punitive measures against allies have revived questions about the alliance's future cohesion. Pablo Calderon Martinez, Head of Politics and International Relations at Northeastern University London, said Spain cannot be legally removed from NATO. He said: 'There is no legal mechanism to remove a member. However, there is a mechanism for a member to withdraw voluntarily.' A more likely scenario, he added, is the U.S. choosing to leave.

Carne Ross, former British diplomat and founder of Independent Diplomat, argued the deeper issue is whether Europe and Washington still share common values. He said: 'Clearly not. Trump is anti-democratic. He tried to undermine democracy, challenge the 2020 election results, and incite a violent mob to storm the Capitol. What more evidence is needed that European values are not shared in Washington?'

Is Europe preparing for a future without the U.S.?

European countries have pledged to sharply increase defense budgets, with many aiming to spend 5% of annual gross domestic product (GDP) on their militaries. Though Trump cannot withdraw the U.S. from NATO without congressional approval, doubts about Washington's commitment have unsettled many European capitals. This has created new urgency around boosting European defense capabilities and building a more reliable European pillar within or alongside NATO. Carne Ross argued Europe's major powers should begin serious planning for greater self-reliance: 'Europeans, especially the most powerful countries—Britain, France, Germany, and Italy—need to talk about how to defend themselves without the U.S.'