PART 2

EUROPE’S CLAIM OF COLLECTIVE DEFENSE

LISBON TREATY ARTICLE 42(7)

INTRODUCTION

For a very long time, serious disagreements have existed between the United States and NATO member states in Europe regarding the understanding of collective defense.

A significant part of Europe kept defense spending at minimal levels for decades, reduced its own military-industrial capacity, and in some countries allowed military production capability to decline to almost symbolic levels. While defense budgets were redirected toward social spending and pension systems, the resulting security gap was largely treated as something the United States was naturally expected to cover.

Today, however, the same political circles are speaking about a new security architecture under the name of a “European Army.” Yet a fundamental contradiction exists here. The structure being discussed is, in reality, heavily dependent on NATO’s already existing command-and-control system, air defense network, logistical infrastructure, satellite and intelligence support, as well as NATO-assigned air and naval forces.

In other words;

Rather than a completely independent military structure, what exists is largely an attempt to repackage the existing NATO umbrella under a different political narrative and a different name.

What is even more striking is the following:

A considerable portion of the circles promoting this structure increasingly employ a political language that excludes NATO member states which are not members of the European Union. While the role of countries such as Türkiye — which possess major military capabilities — is being downplayed within the European security architecture, abandoning the military protection mechanisms provided by NATO at the same time does not appear realistic.

What Europe is debating today is not merely the issue of “building an army.”

The real debate concerns who will carry the burden of security, to what extent political leadership can truly act collectively during wartime, and most importantly, whether Europe can realistically sustain its own defense without the United States.

For this reason, the debate surrounding a “European Army” is not a technical discussion, but directly a geopolitical power debate.

And when the current picture is examined, it becomes increasingly clear that Europe still remains dependent on NATO’s military backbone, American strategic capabilities, and above all, the global power projection capacity of the United States.

LISBON TREATY ARTICLE 42(7)

THE LIMITS OF EUROPEAN COLLECTIVE DEFENSE

For many years, the European Union primarily defined itself as a project of economic integration, while security issues were largely handled under the NATO umbrella. However, particularly after the Russia–Ukraine war, Europe’s own security capacity and the concept of “strategic autonomy” have once again become central subjects of debate. During these discussions, one of the most frequently referenced texts has been Article 42(7) of the Lisbon Treaty.

This article is often described as “the European Union’s version of NATO Article 5.” Technically, this comparison may appear partially correct, but from both a military and political perspective, it remains highly debatable.

According to the article, if a member state of the European Union is subjected to armed aggression, the other members are obliged to provide “aid and assistance by all the means in their power.” At first glance, this wording appears strong. However, the critical point is this:

The text does not define automatic military intervention; instead, it describes a support mechanism open to broad political interpretation.

In other words;

“Providing assistance” and “directly entering a war” are not the same thing.

This distinction is particularly important. NATO Article 5 is part of a military alliance backed by decades of integrated command-and-control structures, joint operational planning, air defense networks, logistical systems, combined-force doctrine, and most importantly, American military power.

Article 42(7) of the Lisbon Treaty, by contrast, resembles a political solidarity mechanism far more than a true military alliance.

In fact, the article has only been formally invoked once, following the 2015 Paris attacks by France. Yet the resulting picture was revealing:

European countries provided support to France at varying levels, but no unified or collective European military reaction emerged.

In reality, this demonstrates the true nature of the article itself.

Because today, the European Union still:

  • does not possess a unified army,
  • lacks an integrated command-and-control infrastructure, and in a crisis it remains unclear under which authority forces would actually operate,
  • does not possess NATO-scale joint operational planning, creating serious uncertainty regarding how multinational forces would coordinate during a crisis,
  • has limited strategic airlift capability,
  • possesses nuclear deterrence concentrated in only a few states,
  • and maintains a defense industry that remains highly fragmented.

For this reason, the greatest weakness of Article 42(7) is not legal, but political and military capacity.

More openly stated:

The fact that an agreement appears strong on paper does not mean it will automatically function effectively during a real crisis.

While discussions about a European Army continue, one critical question is often left unanswered: how such a force would actually be transported to the battlefield. Strategic transportation, heavy logistics, and global military deployment capacity still depend heavily on American infrastructure.

Security perceptions within the European Union are also far from identical. While the Baltic states view Russia as a direct military threat, Southern European countries tend to prioritize energy security, migration, and economic fragility. France seeks a more independent European defense identity, whereas a significant portion of Eastern Europe continues to regard the American security umbrella as indispensable.

Therefore, a serious gap exists between theoretical solidarity and actual military will.

The fundamental reality that emerges here is this:

International agreements alone do not create security.

The decisive factors are political will, economic resilience, military capability, and whether states are truly prepared to bear the cost during times of crisis.

This is precisely why Article 42(7) remains controversial. The article exists legally, but how it would actually be implemented depends entirely on the political choices of individual states.

In fact, this also reveals the fundamental reality of the modern international system:

In times of crisis, states first open cost calculations — not treaties.