How Russia’s War Reshaped NATO’s Return to Collective Defense

When the Soviet Union collapsed in 1991, many analysts assumed that the North Atlantic Treaty Organization would quietly fade into history alongside the adversary it had been created to deter. More than three decades later, NATO has not only survived but has undergone its most profound transformation since the Cold War, a shift documented in detail by a new open-access study published in Discover Global Society. The research, conducted by Chick Edmond of Old Dominion University, uses a systematic qualitative content analysis of NATO’s four post-Cold War Strategic Concepts, summit communiqués, defense planning guidance, and elite speeches to trace how the alliance’s threat perceptions and institutional responses evolved between 1991 and 2024. The findings reveal an organization that swung from cooperative security back to hard-edged collective defense, driven above all by Russia’s behavior as what the study calls a revisionist state.

The quantitative contrast between NATO’s first and most recent strategic documents is striking. The 1991 Strategic Concept, drafted amid the disintegration of the Soviet Union, described the security environment as fundamentally transformed and mentioned Russia only twice, each time in the context of cooperation. The word cooperation appeared 37 times in that document, while deterrence appeared just 14 times. The 2022 Strategic Concept, adopted at the Madrid Summit after Russia’s full-scale invasion of Ukraine, references Russia 23 times and characterizes it as the most significant and direct threat to Allied security. In that document, deterrence appears 31 times while cooperation appears only 12. These word-level shifts, the study argues, quantify a deep reorientation of the alliance’s institutional identity from partnership-building toward territorial defense and deterrence.

The study emphasizes that this transformation did not begin in February 2022. Warning signs accumulated over years, starting with Russia’s war in Georgia in 2008, followed by the annexation of Crimea in 2014 and the conflict in the Donbas region. At the 2016 Warsaw Summit, NATO agreed to deploy four multinational battlegroups to Estonia, Latvia, Lithuania, and Poland under the Enhanced Forward Presence framework, a move described in the literature as a historic day for the Baltic states. These battalion-sized units, each led by a framework nation such as the United Kingdom, Canada, Germany, or the United States, were deliberately designed as tripwires: forces too small to repel an invasion alone but large enough to guarantee that any attack would immediately draw the entire alliance into conflict. Since 2022, all four battlegroups have been expanded to brigade level, and NATO’s overall response force has grown to 300,000 troops on high readiness.

The composition and capability of these forward deployments vary considerably, and the study documents these disparities in detail. The British-led battlegroup in Estonia has maintained roughly 1,200 troops with heavy armor including Challenger 2 tanks, while the Canadian-led group in Latvia has struggled with force generation and depends heavily on contributions from Spain, Italy, and Poland. The German-led battlegroup in Lithuania is notable for incorporating Patriot air defense systems, reflecting Berlin’s deepening commitment since 2022, and the American-led formation in Poland is the largest, supported by artillery, aviation assets, and a division-level headquarters. Total forward-deployed personnel on NATO’s eastern flank rose from approximately 5,000 in 2014 to more than 40,000 in 2024, although the study notes that quality remains inconsistent across contributors.

Beyond conventional forces, the research highlights how NATO has adapted to a threat environment that is now explicitly multi-domain. The 2016 Warsaw Summit formally recognized cyberspace as an operational domain, and the alliance has acknowledged that cyberattacks can in principle trigger Article 5 collective defense obligations. Attribution, however, remains a formidable technical and legal obstacle, since identifying the origin of a cyber operation with sufficient certainty to justify a collective response is often impossible. NATO has also confronted hybrid threats, a category of aggression that combines cyberattacks, disinformation campaigns, economic coercion, and political subversion while deliberately staying below the threshold of armed attack. The alliance established a Hybrid Centre of Excellence in Helsinki and created Cyber Rapid Response Teams, while also setting minimum national resilience standards covering critical infrastructure, supply chain security, and societal resistance to manipulation.

Perhaps the most dramatic empirical evidence of changed threat perceptions came from two countries that had avoided military alliances for decades. Finland, which had pursued neutrality since the Cold War era of Finlandization, saw public support for NATO membership surge from roughly 30 percent in 2021 to more than 80 percent in 2022. Swedish support rose from about 35 percent to over 70 percent. Both nations applied for membership, and their accession fundamentally redrew Europe’s strategic map. Finland’s entry brought a 1,340-kilometer border with Russia inside the alliance, roughly doubling the NATO-Russia frontier and complicating Russian military planning in Northern Europe. Finland contributes a modern air force transitioning to F-35 aircraft, while Sweden brings one of the Baltic region’s most capable navies, including Gotland-class submarines designed for shallow littoral waters, along with extensive Arctic and sub-Arctic operational expertise.

The accession process, however, also exposed the internal frictions that consensus-based decision-making can create. Turkey delayed Sweden’s membership for more than a year over disputes concerning Kurdish organizations and extradition requests, and Hungary’s ratification also lagged for largely political reasons. The study argues that these episodes demonstrate how even strategically urgent decisions can be held hostage by bilateral grievances, a structural vulnerability inherent in an alliance of now 32 members that operates by unanimity. Burden-sharing presents a parallel challenge. At the 2014 Wales Summit, NATO set a guideline of 2 percent of GDP for defense spending, a benchmark met by only three members at the time. By 2024, 23 of 32 members had reached or exceeded the target, with Poland at 4.04 percent, the United States at roughly 3.5 percent, and the United Kingdom at about 2.29 percent. Yet the study notes that spending quality matters as much as quantity: only seven members met the separate 20 percent benchmark for major equipment investment, and much of the new money has gone to personnel costs rather than capabilities.

European defense industrial capacity emerges as a critical weakness. The study cites assessments that Europe’s defense industrial base lacks the scale to sustain a major conflict without American support, a concern underscored by the European Union’s failure to deliver its pledge of one million artillery shells to Ukraine within twelve months. Decades of post-Cold War contraction and fragmentation have left national industries without economies of scale, producing deep reliance on United States equipment. This dependency intersects uncomfortably with Washington’s strategic pivot toward Asia and with ongoing debates over European strategic autonomy. France and others have pushed for the European Union to develop independent military capacity through initiatives such as PESCO and the European Defence Fund, while frontline states including Poland and the Baltic members remain skeptical of anything that might dilute the American security guarantee. The 2022 Strategic Concept attempts to square this circle by welcoming EU defense initiatives while insisting they remain supplementary to NATO, which it declares the cornerstone of Euro-Atlantic security.

Theoretically, the study frames NATO’s endurance through three complementary lenses. Realism, particularly Stephen Walt’s balance of threat theory, explains the alliance’s resurgence as a rational response to Russian power, proximity, and demonstrated intent to use force. Liberal institutionalism, drawing on Robert Keohane’s work, accounts for NATO’s survival after its original adversary vanished, since dense institutionalized relationships generate their own inertia by reducing transaction costs and stabilizing expectations. Constructivism, following Alexander Wendt’s insight that anarchy is what states make of it, explains why former Warsaw Pact states sought membership not merely for security guarantees but to affirm their identities as democratic European nations. The study concludes that NATO’s future relevance will depend on whether it can sustain a political coalition capable of supporting both military deterrence and continuous innovation in technology and strategic thought, a test that an increasingly unpredictable security environment will keep applying for years to come.

Subject of Research: NATO's post-Cold War institutional transformation and its response to Russian revisionism in the European security environment

Article Title: NATO’s evolution and European security dynamics

Article References: Edmond, C. (2026). NATO’s evolution and European security dynamics. Discover Global Society, 4(1), Article 234. https://doi.org/10.1007/s44282-026-00594-1

Image Credits: AI Generated

DOI: 10.1007/s44282-026-00594-1

Keywords: NATO, European security, collective defense, deterrence, Russia, Ukraine war, hybrid threats, cyber defense, Finland, Sweden, burden sharing, strategic autonomy