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President Nikos Christodoulides has called on the European Union to resume discussions on its mutual defense commitments, warning that the bloc must be prepared to respond collectively to armed aggression against any member state.
In a letter dated October 20 to European Commission President Ursula von der Leyen, Christodoulides asked for an update on proposals concerning Article 42.7 of the Lisbon Treaty and a timetable for further action.
“I cannot overstate the importance of this provision for the EU and its Member States, especially in times of geopolitical uncertainty,” Christodoulides wrote.
The president also called for discussions to resume within the EU's relevant preparatory bodies, signaling Cyprus' interest in turning the bloc's mutual assistance commitment into a more clearly defined and practical security arrangement.
What the EU's mutual defense clause means
Article 42.7 of the Treaty on European Union requires member states to provide aid and assistance to another EU country that suffers armed aggression on its territory. The treaty specifies that members must offer support through all the means available to them.
The provision is one of the EU's central commitments to collective security, although its practical application differs from NATO's collective defense framework. The clause does not prescribe a single military response, leaving countries to determine the assistance they can provide in accordance with their capabilities and national policies.
Its implementation could shape how European partners coordinate diplomatic, military, logistical and other forms of support if an EU member faces an armed attack. The question has gained importance as European governments reassess their security arrangements in response to Russia's war against Ukraine, tensions in the Middle East and uncertainty over the future of transatlantic relations under US President Donald Trump.
EU countries have also faced hybrid threats, including cyberattacks, disinformation campaigns and other forms of hostile activity. Although these challenges do not automatically trigger Article 42.7, they have added to the debate over how the bloc should protect its members and respond to security emergencies.
Cyprus puts security commitments to the test
The issue took on immediate relevance for Cyprus in March, when Iranian drones struck a British military base on the island. The incident brought regional hostilities closer to Cypriot territory and reinforced the importance of preparedness, coordination and clear communication between European partners.
During its six-month presidency of the Council of the European Union, which ended on June 30, Cyprus made the mutual defense clause a priority. Earlier this year, the bloc also conducted exercises to examine how the provision could operate in practice.
Such preparations are important because a treaty commitment alone does not settle the operational questions that would arise during a security crisis. Governments would need to establish how assistance would be requested, coordinated and delivered, as well as how national resources and existing defense arrangements would be used.
Christodoulides' latest letter seeks clarity on the progress made so far and the next steps in that process.
Defense talks compete with other EU priorities
Despite the earlier work, discussions on Article 42.7 have lost momentum as the EU focuses on other pressing political and financial matters.
Among the bloc's immediate priorities are negotiations over its next seven-year budget, valued at almost €2 trillion, and securing additional support for Ukraine. These demands have placed pressure on the EU's agenda as member states weigh competing spending commitments.
An EU official told POLITICO that Article 42.7 is not currently scheduled for discussion at upcoming European leaders' summits.
The absence of a planned summit discussion does not mean the treaty provision has been abandoned. However, it leaves open questions about when member states will return to the issue and whether the earlier exercises will lead to more detailed procedures for responding to an attack.
Christodoulides is now seeking an update from von der Leyen on the proposals under consideration and when further work can be expected. The response could help clarify whether the EU intends to give its mutual defense commitment a more prominent place in its security planning.
