NATO Details 'Block, Blunt, Break' Doctrine for European Defense

NATO’s Supreme Allied Commander Europe, General Alexus Grynkewich, has publicly announced the alliance's new “theory of victory” at the Warsaw Security Forum.¹ This strategic framework, which outlines how NATO forces would counter aggression, was agreed upon in a classified version by all 32 member nations approximately three months ago.¹² It is designed not as a rigid military plan but as a conceptual guide to convince a potential adversary that an attack would ultimately fail.¹ The strategy is structured in three sequential stages, referred to as “block, blunt, and break.”¹ By establishing an agreed conceptual baseline among all 32 members, the alliance seeks to ensure that any potential adversary understands that military aggression will be met with a unified capability that guarantees the failure of an attack.¹²

The initial “block” phase would involve land forces dominating an enemy’s initial assault.¹ These ground troops would be reinforced by air, naval, space, and cyber forces working to secure the wider battlespace.¹ Should an attack continue past this first stage, the “blunt” phase would be initiated to slow the aggressor's advance.¹ The final “break” stage would seek to destroy not only the invading force but also the entire network that supports, sustains, or controls it.³ In combining multi-domain operations across air, naval, space, and cyber environments with ground defense, the approach ensures that an invading force is thoroughly blocked and progressively dismantled along with its sustaining support.¹³

The explicit military objective of this framework is to inflict a tactical and operational defeat on attacking forces.¹ Success is defined as preventing an aggressor from seizing and holding any allied territory.¹ Officials have clarified that this goal does not extend to inflicting a strategic defeat upon the adversary's home nation.¹ The new doctrine builds upon foundational work developed by retired General Chris Donahue, who previously led the alliance's Land Command.⁵

To test this new theory, NATO is currently conducting a 10-day wargame named “Steadfast Duel.”⁵ The exercise involves more than 20,000 personnel simulating a defense against an invasion originating from the east.⁵ A German general involved in the exercise confirmed that it is fully tied to General Grynkewich's new doctrine.⁵ A primary focus of the simulation is the use of data-centric processes to inform and accelerate decision-making.⁵ With over 20,000 personnel taking part across a 10-day span, the exercise provides a large-scale operational test of how data-driven systems can directly support the newly formulated theory of victory.⁵

General Grynkewich explained that he discussed the plans publicly to reassure the one billion citizens living in NATO countries.³ His announcement was a response to public nervousness that has grown following recent acts of sabotage.³ This public disclosure is seen as part of a dual strategy to calm allied populations while also deterring potential adversaries.¹ Addressing the nervousness felt by one billion alliance citizens is intended to bolster public confidence in collective defense while sending a transparent deterrent signal to potential adversaries.¹³

Despite the detailed planning, the commander stated that he does not believe a conflict is imminent or inevitable.¹ He emphasized, however, that maintaining a high state of readiness is an essential part of the planning process.¹ The introduction of the “theory of victory” is viewed as a significant change in NATO's overall posture.¹ It appears to mark a transition from a post-Cold War peace footing toward active preparation for a large-scale conventional war on its eastern flank.¹

The strategic shift comes at a time when European governments have accused Moscow of conducting an escalating campaign of “shadow warfare.”⁵ These allegations include an increase in sabotage, cyberattacks, and incursions by drones.⁵ This context aligns with NATO's 2022 strategic concept, which formally identified Russia as the most significant and direct security threat to the alliance.⁴ Because Moscow was designated the alliance's most significant security threat in 2022, member states view these mounting cyberattacks, drone incursions, and sabotage actions as an escalating security challenge.⁴⁵

Within the alliance, there is a perception that the Russian president's tolerance for risk and recklessness is growing, according to Deputy NATO commander Johnny Stringer.⁵ The new “block, blunt, break” doctrine is considered a direct strategic response to this perceived threat from Russia.⁵ This approach is consistent with the alliance's official designation of Russia as its primary security challenge.⁴⁵

Despite the public declarations of readiness, NATO is reportedly facing considerable internal challenges.¹ The alliance is experiencing shortages of American-made PAC-3 Patriot and Atacms missiles within Europe.⁵ These supply issues are a result of munitions being diverted to the Middle East.⁵ Such logistical problems are seen as a significant complication for the alliance's defense posture.¹ These munitions deficits in PAC-3 Patriot and Atacms systems illustrate the logistical difficulties confronting the alliance as hardware is reallocated to the Middle East instead of remaining in Europe.¹⁵

Adding to logistical issues are political uncertainties, particularly regarding the future of the U.S. military presence in Europe.¹⁵ A wide-ranging Pentagon review of America's global military posture is currently underway and could lead to a reduction of U.S. forces on the continent.⁵ To counter concerns about American commitment, General Grynkewich highlighted the current U.S. military deployment on the Eastern Flank.³ He also pointed to President Trump's reception at a July NATO summit in Ankara as evidence of continued U.S. engagement.³