The EU’s delicate debate on its self-defense clause

EU countries are rethinking how they would respond if one of them is attacked — but those closest to Russia fear it could blur NATO’s role, POLITICO writes.

Kaja Kallas, the bloc's top diplomat, will briefed EU leaders on Article 42.7 of the EU Treaty, which obliges member states to provide aid and assistance “by all the means in their power” if another EU country is attacked.

The problem: no one is quite sure how it would work. Officials are now gaming out how to use the clause in a crisis, underscoring growing unease about Europe’s security setup. When Cyprus was hit by Iranian drones last month, it didn’t invoke 42.7 at all.

That ambiguity is becoming harder to ignore. With fears of a potential Russian attack rising — and doubts about U.S. commitments under Donald Trump — some in Brussels want to clarify how the clause would operate. It has only been triggered once, by France after the 2015 terrorist attacks.

There is a NATO Article 42.7 mutual defense, but it is not clearer how it works

However, EU countries are concerned that too much focus on 42.7 could impact NATO — the basis of their security. While the EU article is largely political and legal, NATO's Article 5 would bring in alliance militaries, which have spent decades preparing and training together, along with the full power of the United States.

Hanno Pevkur, Estonia’s defense minister, called Article 5 “the bedrock of collective security,” describing Article 42.7 as “a vital expression of European solidarity,” but underlining that the NATO provision “holds the layer of operational military readiness that ensures our defense."

As part of the effort to flesh out how 42.7 works, national ambassadors on the Political and Security Committee will hold a closed-door meeting on May 4, where they will take part in a table-top exercise on invoking the article.

Angering Trump

Behind closed doors, diplomats worry that if the EU fleshes out 42.7, it could increase anti-NATO sentiment in Washington.

Trump has undermined Article 5 on multiple occasions. He warned the U.S. would not defend countries that don't spend enough on defense, denigrated allied contributions to the NATO operation in Afghanistan and warned that the lack of enthusiasm about getting involved in the war he started against Iran is making him reconsider U.S. membership in the Atlantic alliance.

"Allies that still fail to do their part for collective defense will face consequences," warned Defense Secretary Pete Hegseth, as the U.S. reportedly looks to punish allies falling short of Trump's demands.

Despite mixed signals from Washington, vulnerable allies want to ensure the U.S. sticks with NATO.

“It is hard to rely on Article 5, but we all want to keep the alliance together,” argued a third EU diplomat.

Starting the conversation

This week's effort to address Article 42.7 is being led by Cyprus, the host of the leaders' meeting as it's currently heading the rotating presidency of the Council of the EU. Cyprus is also one of the four EU countries that don't belong to NATO, which means it's not covered by Article 5.

Cyprus did not invoke 42.7 after the drone attacks. But Greece, France, Italy, Spain, and the Netherlands responded quickly to Cypriot requests for assistance by deploying assets; Christodoulides said still amounted to a test of the effectiveness of Article 42.7.

Christodoulides said because most EU countries also belong to NATO, there should be an effort to clarify how they would respond to Article 42.7 without clashing with their NATO obligations.

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