Putin's Force Expansion and the Shifting Dynamics of the Ukraine War: March 2026 Assessment

The first two weeks of March 2026 have revealed a stark recalibration in Russian military strategy, marked by significant force expansion, doctrinal shifts, and a complex battlefield picture that defies simple narratives. As the war in Ukraine enters its fifth year, Moscow's approach reflects both desperation and determination, while Ukrainian forces demonstrate unexpected resilience in select sectors.

On March 4, Russian President Vladimir Putin signed a decree increasing the authorized end strength of the Russian Armed Forces to 2,391,770 total personnel, including 1,502,640 military personnel. This represents the latest in a series of incremental expansions that have characterized Russia's military buildup throughout the conflict. The decree follows similar increases in September 2024 (to 2,389,130 personnel) and marks a continuation of Moscow's struggle to sustain combat operations while simultaneously pursuing broader military restructuring goals that predate the Ukraine invasion.

The expansion decree must be understood within the context of Russia's grinding attrition warfare strategy. Institute for the Study of War assessments suggest that Russia has been forced to continuously replenish forces committed to Ukraine operations, making it difficult to pursue the comprehensive military reorganization that Russian planners had envisioned before February 2022. The gap between authorized strength and actual recruitment capabilities remains a persistent challenge, with Russian forces increasingly relying on recruitment bonuses, regional mobilization efforts, and foreign fighters to fill ranks.

Perhaps more concerning than raw numbers is the apparent shift in Russian nuclear posture. Multiple analyses published in early March 2026 indicate that Russia is transitioning from a traditional defensive nuclear deterrence model toward what defense experts characterize as "offensive nuclear deterrence and intimidation." This evolution represents a fundamental departure from Cold War-era Soviet doctrine and raises troubling questions about escalation thresholds. The change appears designed to leverage nuclear threats as a tool for battlefield advantage rather than purely as a deterrent against existential threats to the Russian state.

This doctrinal evolution has manifested in increasingly explicit nuclear signaling from Russian officials. On March 5, Deputy Chairman of the Security Council Dmitry Medvedev made veiled nuclear threats in response to Western military assistance to Ukraine, a pattern that has become disturbingly routine but nonetheless carries weight given Russia's revised posture. The shift toward offensive nuclear deterrence may reflect Moscow's assessment that conventional military options have proven insufficient to achieve strategic objectives in Ukraine.

On the ground, the military picture remains complex and regionally variable. February 2026 marked a significant milestone: according to Ukrainian military spokesman Komarenko, it was the first month since 2024 when Ukrainian forces regained more territory than they lost. Ukrainian forces cleared approximately 400 square kilometers during this period, suggesting that select counteroffensive operations have achieved tactical success despite resource constraints.

However, Russian forces continue to make incremental gains in critical sectors, particularly in the Zaporizhzhia direction. The Institute for the Study of War confirmed Russian control over the strategically significant city of Huliaipole on February 6, representing a major tactical achievement for Moscow. Russian forces had been working to link advances in the Huliaipole and Orikhiv directions, potentially enabling future operations toward Zaporizhzhia City itself. The capture of Huliaipole demonstrates that despite mounting losses, Russian forces retain offensive capability in priority sectors where they can concentrate combat power.

The Russian 5th Combined Arms Army has been central to operations in southern Ukraine, achieving what ISW characterized as a tactical breakthrough north and northeast of Huliaipole in early December 2025. This success has enabled subsequent Russian advances toward Orikhiv from multiple directions, creating the operational conditions for deeper penetrations. Russian milbloggers and the Ministry of Defense have claimed numerous village captures in Zaporizhzhia Oblast throughout February and early March, including Zelene, Olenokostyantynivka, Pryluky, and surrounding settlements.

Meanwhile, in the Kharkiv and Kupiansk sectors, fighting remains intense but inconclusive. Geolocated footage has shown Ukrainian forces operating in areas Russian sources claimed to control, suggesting continued fluidity in front-line positions. Russian forces have claimed advances in villages including Podoly, Petropavlivka, and Symynivka, but Ukrainian counterattacks have reportedly recaptured some positions, including Kurylivka and Kucherivka near Kupiansk.

The air and maritime domains continue to see aggressive Ukrainian operations targeting Russian logistics and industrial infrastructure. Ukrainian forces conducted strikes on the frigate Admiral Essen in early March, with Ukrainian sources reporting the vessel can no longer fire Kalibr cruise missiles. Ukrainian drones have systematically targeted Russian oil refineries, military arsenals, and command facilities throughout March, with confirmed strikes in Volgograd, Yaroslavl, Penza, Sterlitamak, and deep into Russian territory.

Of particular significance was the Ukrainian strike on the 100th Arsenal of the Main Missile and Artillery Directorate in Neya, Kostroma Oblast, which supplies ammunition storages in the Central and Moscow Military Districts. Such deep strikes demonstrate Ukraine's expanding strike capabilities and suggest that Western-supplied intelligence support remains robust despite political uncertainties.

The Collective Security Treaty Organization Joint Staff meeting on March 10 provides additional context for understanding Russia's regional military posture. The CSTO conducted preparations for the Barrier-2026 military exercise, with Russian and Belarusian defense ministry representatives discussing priorities in military medicine, protection against biological threats, and chemical, biological, and radiological defense. This coordination suggests Russia continues to maintain broader regional security commitments even while Ukraine operations consume vast resources.

The strategic implications of current trends are sobering. Russia's force expansion indicates an intent to sustain combat operations indefinitely, while the shift toward offensive nuclear deterrence suggests Moscow may be preparing escalatory options if conventional operations continue to stall. Ukrainian forces have demonstrated resilience and tactical innovation, but face persistent ammunition shortages and personnel constraints that limit the scope of counteroffensive operations.

Western military assistance remains critical to Ukraine's ability to sustain operations. The provision of Storm Shadow missiles, HIMARS systems, and advanced air defense capabilities has enabled Ukrainian forces to target Russian logistics networks and protect critical infrastructure. However, the long-term sustainability of this support amid shifting political dynamics in Western capitals remains uncertain.

Looking ahead, the spring and summer of 2026 will likely prove decisive. Russia's expanded force structure may enable renewed offensive operations once weather conditions improve, particularly if Moscow can successfully integrate newly recruited personnel. Conversely, Ukrainian forces may seek to capitalize on current momentum in select sectors while Russian forces complete reorganization and training. The outcome will depend on complex factors including ammunition availability, Western support levels, and the durability of Russian domestic support for continued mobilization.

What is clear is that the war has entered a phase characterized by mutual exhaustion but continued willingness to commit resources. Putin's force expansion decree signals that Moscow views this as a long-term struggle requiring sustained military buildup. Ukraine's February territorial gains suggest that defensive resilience and selective counterattacks remain viable. The collision between these strategies will shape the battlefield landscape for months to come.