European Union leaders meeting in Brussels on March 6, 2025, backed a major effort to increase European defense spending while reaffirming support for Ukraine at a moment of acute uncertainty over the future of U.S. military assistance.
The special European Council focused on two closely connected issues: strengthening Europe's own defense capabilities and determining how the bloc could continue supporting Ukraine as the Trump administration reassessed Washington's approach to the war.
EU leaders described Russia's war against Ukraine and its consequences for European security as an "existential challenge" for the European Union. They also stressed that a stronger European defense role was intended to complement NATO rather than replace it, with NATO remaining the foundation of collective defense for its members.
EU Leaders Back a Major Defense Expansion
The summit endorsed the direction of European Commission proposals designed to create substantially more room for national defense investment.
In their formal conclusions on European defense, leaders welcomed plans to use flexibility under the EU's fiscal rules to facilitate higher national defense spending. They also took note of a proposed EU-backed lending instrument worth up to €150 billion and asked the Council to examine it urgently.
European Commission President Ursula von der Leyen had outlined the broader initiative two days earlier, saying that the proposed measures could mobilize close to €800 billion in additional defense-related resources under favorable assumptions about national spending increases.
The areas identified for additional investment included air and missile defense, artillery, ammunition, missiles, drones and counter-drone systems, military mobility, cyber capabilities, electronic warfare and other strategic capabilities.
European Council President António Costa said after the meeting that Europe was moving toward a stronger and more sovereign defense posture. He also emphasized joint procurement, standardization and efforts to strengthen Europe's defense-industrial base.
Support for Ukraine — With One EU Leader Outside the Statement
Ukraine remained the second major focus of the summit. President Volodymyr Zelenskyy joined EU leaders for discussions at the beginning of the meeting.
The European Council's Ukraine text received the support of 26 of the EU's 27 heads of state or government rather than unanimous backing. Hungarian Prime Minister Viktor Orbán did not support the text.
The 26 leaders set out several principles for any diplomatic process. They said negotiations concerning Ukraine could not take place without Ukraine and that negotiations affecting European security could not proceed without Europe's involvement. They also said any peace agreement should respect Ukraine's independence, sovereignty and territorial integrity and be accompanied by credible security guarantees.
The leaders called for further efforts to address Ukraine's military needs, including air-defense systems, ammunition, missiles, training and equipment, while supporting closer cooperation between Ukraine's defense industry and Europe's.
At the time of the summit, the EU said it and its member states had provided €135.4 billion in support to Ukraine since Russia's full-scale invasion began in February 2022, including €49.2 billion in military assistance.
U.S. Military Aid Suspension Raised the Stakes
The Brussels meeting took place only days after the Trump administration suspended U.S. military assistance to Ukraine following a contentious February 28 meeting between President Donald Trump and Zelenskyy at the White House.
The suspension intensified European debate about how much of Ukraine's defense burden Europe could assume if U.S. support declined for an extended period.
That situation later changed. Following U.S.-Ukraine talks in Saudi Arabia, Washington resumed military assistance to Ukraine on March 11, 2025. That later development is important context: the aid freeze shaped the atmosphere surrounding the March 6 European summit, but it did not remain in force indefinitely.
NATO's subsequent annual report also provided useful context for the balance of assistance in 2024. NATO said allies committed approximately €50 billion in security assistance to Ukraine that year, with more than half coming from European allies and Canada.
Europe's Nuclear Deterrence Debate
The changing transatlantic environment also revived discussion about Europe's long-term deterrence arrangements.
In a March 5 address, French President Emmanuel Macron said the United States had changed its position on the Ukraine war and that Europe needed to strengthen its ability to defend itself.
Macron also announced a strategic debate over whether France's nuclear deterrent could play a broader role in protecting European allies. He stressed, however, that decisions concerning the French nuclear arsenal would remain under the authority of the French president.
The proposal did not amount to an agreement creating a European nuclear umbrella. Rather, it opened a discussion about how France's existing deterrent might relate to the security of European partners as governments reassessed their dependence on the United States.
A Broader Shift in European Defense Policy
The March summit reflected a wider acceleration in European defense policy rather than a single spending decision.
Germany was simultaneously debating major changes to its fiscal framework to create more room for defense and infrastructure spending, while Poland and other countries on NATO's eastern flank were pushing for faster investment in military capabilities.
Norway, which is a NATO member but not an EU member, also expanded its support for Ukraine. In March 2025, Norwegian political parties agreed to increase the country's Ukraine allocation by NOK 50 billion for the year, bringing its planned 2025 support to NOK 85 billion.
The EU continued advancing the defense agenda after the March meeting. By June 2025, the European Council was still describing the goal as a decisive increase in European defense readiness over the following five years while reiterating that stronger EU defense capabilities should remain complementary to NATO.
What the March Summit Actually Changed
The March 6 meeting did not create a unified European army or immediately replace U.S. military capabilities. Nor did the proposed €150 billion mechanism represent money that had already been distributed to member states on the day of the summit.
Instead, EU leaders established political backing for a substantial expansion of defense investment, urged rapid work on the proposed financing mechanisms and identified priority capabilities for joint European action.
For Ukraine, the meeting demonstrated broad — though not unanimous — EU political support and established principles that 26 leaders wanted reflected in any future peace process.
The summit therefore marked an important stage in Europe's response to a changing security environment: governments were preparing to assume greater responsibility for conventional defense while still treating NATO and continued transatlantic cooperation as central to European security.
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