Joseph Stalin famously said that quantity has a quality of its own. Russia has put that maxim to the test in Ukraine, and the results show both the power and the limits of mass.
Since the invasion began, Russia has grown its deployed force from roughly 150 battalion tactical groups to over 700,000 personnel, according to Greg Whisler and Michael Kofman, writing in War on the Rocks. The military expanded dramatically despite approaching 500,000 killed in action by some estimates.
Yet mass could not produce decisive breakthroughs. Ukrainian adaptation, drones, minefields, prepared defenses, combined with Western precision fires turned Russia’s numerical advantage into a grinding war of attrition without the operational payoff Moscow expected.
The story of Russian force expansion is a story of improvisation under pressure. The pre-war Russian army was the smallest in over 100 years, optimized for short local wars with contract soldiers, not for a protracted conflict on the scale of Ukraine. There was no replacement system and no operational reserve.
After the initial defeats around Kyiv, Russia scrambled. It formed private military companies, most notably Wagner, regional volunteer units, and a hastily assembled 3rd Army Corps in summer 2022. The early workaround was concentrated artillery to compensate for infantry shortages. It worked temporarily, until HIMARS disrupted the logistics.
Putin’s partial mobilization in September 2022, ordered after Ukraine’s Kharkiv counteroffensive, called up 300,000 reservists. They were organized into roughly 70 reserve regiments and dozens of separate battalions. The mobilization stabilized the defensive lines but revealed deep rust in Russia’s military apparatus. Tens of thousands fled the country.
From 2023 onward, Moscow shifted to contract soldier recruitment. The target was 420,000 new contracts in 2023, compared to a pre-war total of roughly 400,000 contract soldiers across the entire military. They claimed to have met it, plus 80,000 volunteers. By the end of 2023, Russia had 617,000 personnel in the “zone of the special military operation.” Authorized strength was raised to 1.32 million.
The result was a massive force expansion: two new combined-arms armies, two new motorized rifle divisions, 27 new maneuver brigades and regiments, and new assault companies, the infamous Storm-Z and Storm-V units. Infantry per regiment rose from roughly 500-600 to as many as 2,000.
By 2024, Russia aimed for another 400,000-450,000 contract soldiers and roughly achieved it. But the quality continued to decline. Tactics devolved to dismounted infantry assaults of six to eight men. Armored vehicles were used only as “battle taxis”, losses to drones and mines were too high for anything more ambitious. Offensives became a long, creeping grind without breakthroughs.
In 2025, Russia recruited roughly 403,000 contract soldiers, but losses matched recruitment. Killed and seriously wounded equaled the number of new troops coming in. Mechanized assaults were abandoned entirely in favor of infiltration tactics.
The war demonstrates that mass still matters, Russia was able to survive defeats, rebuild its army, and sustain a multi-year war of attrition that few thought possible in 2022. But mass has its limits on a battlefield dominated by drones, precision fires, and prepared defenses. Quantity has a quality of its own. But that quality is not victory.