This clause, found within the treaty that forms the foundation of the EU, requires member countries to assist one another if a fellow member is attacked. However, officials indicate that there are currently no definitive guidelines on how this should function in reality.
Trump’s criticism of NATO for not supporting the United States’ involvement in the Iran conflict, along with his previous threats regarding Greenland and ally Denmark, have heightened the urgency to clearly outline the EU’s mutual assistance obligations.
“I believe that the situation with Greenland has highlighted the need for this discussion,” remarked an EU diplomat.
Cyprus, which presently holds the rotating EU Council presidency, is advocating for a more serious approach to the pact following a drone strike on a British military base on the island last month during the Iran war.
At the meeting in Cyprus, EU foreign policy chief Kaja Kallas is anticipated to brief leaders on the types of assistance that can be offered under the clause, according to an EU official.
Additionally, senior diplomats are preparing to conduct scenario-based tabletop exercises in the upcoming weeks to enhance their understanding of how the clause could operate in practice, the diplomat added.
“What was lacking was specific scenarios and options prepared in advance for instances where countries might seek assistance,” noted Juraj Majcin, a policy analyst at the European Policy Centre, a Brussels-based think tank.
“Considerable thought will be given to what our union can facilitate and how to streamline this process,” he stated.
Diverging views on mutual assistance
Article 42.7 of the Treaty on the European Union specifies that “if a Member State is the victim of armed aggression on its territory, the other Member States shall have towards it an obligation of aid and assistance by all means in their power.”
The treaty further clarifies that this “shall not affect the specific character of the security and defence policy of certain Member States” and that any actions must align with commitments to NATO.
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This clause has been invoked only once — by France following the 2015 Paris terrorist attacks — when member states supported EU and international military missions, enabling France to reposition its forces.
Cyprus is particularly motivated to further develop Article 42.7, given its non-membership in NATO and the lack of protection from the alliance.
On the other hand, some countries are wary of any actions that might be perceived as moving the EU away from NATO and its Article 5 mutual defence commitment.
“We should steer clear of interpretations suggesting this is a contingency if NATO collapses and the US withdraws,” emphasized a second EU diplomat.
NATO still seen as Europe’s defence ‘cornerstone’
NATO’s Article 5 declares that an attack on one member is deemed an attack on all, requiring allies to take necessary actions they deem appropriate to assist the affected country, which may include military force.
This article continues to be widely viewed as Europe’s ultimate security guarantee, bolstered by established military frameworks and the support of the United States, a nuclear-armed superpower.
Latvia’s Foreign Minister Baiba Braze stated in a release to Reuters that her country “views NATO as the cornerstone of collective defence.”
“The potential activation and further development of Article 42.7 must complement NATO efforts, seek synergies, and should never be seen as an indication of distrust in NATO or a weakening of the alliance,” she added.
Latvia “believes that maximum flexibility must be maintained” when implementing the article, allowing the affected EU member to decide the type of assistance needed in the case of armed aggression or hybrid threats.
