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Russia loses 100 sq miles in four weeks

3 min read

15:43UTC

ISW data compiled by Russia Matters shows Russia net-lost 38 square miles in the week of 19-26 May, its largest single-week reversal of 2026, and 100 square miles over four weeks. Russia's net advance rate for January-May 2026 is 94% below the same period in 2025.

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Key takeaway

Russia's net advance rate collapsed 94% year-on-year as it net-lost 100 sq mi in four consecutive weeks.

Russia net-lost 100 square miles of Ukrainian territory over four weeks (28 April to 26 May), including 38 sq mi in the week of 19-26 May, according to ISW data compiled by Russia Matters at Harvard's Belfer Center. Russia's operational pattern since the full-scale invasion has been incremental advance punctuated by Kursk-style reversals; a four-week sustained net-loss run is something else.

The net advance rate collapsed 94% year-on-year, from 1,619 sq km in January-May 2025 to 104 sq km in the same window of 2026. Seasonal factors cannot account for that. It tracks the period of Ukraine's most intensive drone campaign against Russian logistics and training infrastructure.

For Russia's defence establishment, the data bites. The 2026 defence budget of 13.5 trillion rubles was calibrated on higher advance rates. At current attrition and territorial costs, each ruble buys less than a fifth of the territory it bought in 2025.

NATO Secretary General Mark Rutte said on 21 May that Ukraine's defences are "stabilising the frontline," the closest the Alliance has come to acknowledging a Ukrainian operational advantage. ISW recorded Russia's first net monthly loss since the August 2024 Kursk incursion , then 12 sq mi lost in 5-12 May and 29 sq mi in 12-19 May ; the four-week figure extends that reversal to its deepest point.

Deep Analysis

In plain English

Russia is losing ground in Ukraine at the fastest rate since 2024. Over four weeks from late April to late May, it gave back roughly 100 square miles of territory it had taken earlier in the war. To put that in perspective: in the first five months of 2025, Russia gained around 1,000 square miles. In the same period of 2026, it has gained only about 40 square miles total, and is now losing ground. This military failure is directly connected to Russia's missile escalation: the Kremlin is using its most powerful weapons to create the appearance of military dominance while its troops retreat on the ground.

Deep Analysis

Root Causes

Ukraine's drone campaign against Russian logistics, training infrastructure, and refinery supply has degraded the support chain that sustains frontline Russian units. Destroying fuel supply (11 refineries struck in May) and training pipelines (Snizhne and Starobilsk) simultaneously reduces both the operational reach and replacement rate of frontline Russian forces.

Russia's 2026 defence budget was calibrated on the 2025 advance rate of 9.76 sq km per day. At the actual 2026 rate of 2.9 sq km per day during January-April, followed by net losses in May, the budget is funding operations at a cost-per-kilometre roughly five times higher than planned. That fiscal mismatch becomes unsustainable as the National Wealth Fund approaches the floor at which it can no longer cover deficit financing.

What could happen next?

Consequence
Russia's spring-summer offensive plans are operationally bankrupt at current attrition rates; the Kremlin must accept a defensive posture or commit reserves the 2026 budget cannot fund.
Opportunity
Ukraine's demonstrated counterattack capacity strengthens Kyiv's negotiating position in any future ceasefire format by establishing a favourable baseline front line.

Source Landscape

This story draws on neutral-leaning sources from United States

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Primary parallel: Germany's Westwall period of 1944, after the failed Ardennes offensive, is the closest structural match: a military power that had been gaining ground absorbs a four-to-six-week net-loss period driven by superior enemy logistics and air power, then faces a fundamental choice between committing strategic reserves to restore momentum or accepting a defensive posture.

Germany committed its last operational reserves in the Ardennes and exhausted them. Russia faces a comparable decision at significantly worse fiscal conditions.

Counter-parallel: Russia's own experience after the Kharkiv withdrawal in May-June 2022 is more optimistic for Moscow: a rapid loss of 3,000 sq km was followed by a summer stabilisation and the Kherson-Zaporizhzhia offensive push that autumn. The key difference is that Russia still had NWF reserves at 10+ trillion rubles in 2022; liquid assets are now under 3.6 trillion rubles.

Consensus view: The Harvard Belfer Center's Russia Matters project and ISW both assess the 94% collapse in Russia's net advance rate as the product of three simultaneous pressures: Ukraine's drone campaign against logistics and training, the Zaporizhzhia counteroffensive denying Russia the operational initiative in the south, and increased Ukrainian artillery precision reducing Russian assault effectiveness.

No single factor explains the collapse; the combination has created a compounding feedback loop .

Counter-view: The Moscow Carnegie Center argues Western analysts are over-reading the four-week loss as a structural reversal. Russia's historical pattern, including Kursk Oblast in 2024 and Kharkiv Oblast in 2022, is to absorb a sustained net-loss period, absorb the reputational cost domestically, and then return to offensive tempo by committing reserves. The current retreat may be a tactical pause ahead of a summer offensive rather than a strategic collapse.

Key tension: Whether Russia's defence budget, set at 13.5 trillion rubles on 2025 advance-rate assumptions , can fund the reserves needed for a summer recovery push at the tripled 2026 attrition cost, or whether the fiscal constraint makes a renewed offensive structurally unaffordable.

Sources:ISW / Critical Threats·ISW / Critical Threats·Russia Matters (Harvard Belfer Center)

Mentions:Institute for the Study of War →Russia Matters →Russia →Ukraine →Germany →Kharkiv →Zaporizhzhia counteroffensive →Kremlin →Oreshnik →NATO →Kherson →Moscow →Harvard Belfer Center →Zaporizhzhia →Kursk →Mark Rutte →

First Reported In

Update #18 · Oreshnik doubles as Russia's front collapses

ISW / Critical Threats· 1 Jun 2026

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Causes and effects

Caused by

Front stalls as death toll climbs

The front stall on 7 June (no confirmed Russian advances) continues the pattern of Russian net losses documented by ISW (ID:3808), while mounting Mediazona casualties confirm the attrition cost.

Occurred 7 Jun 2026

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This Event

Russia loses 100 sq miles in four weeks

Four consecutive weeks of Russian territorial retreat, culminating in its worst position since August 2024, is the military context in which the dual Oreshnik launch occurred; the weapons escalation and the front-line collapse are directly correlated.

Led to

Russia fires first dual Oreshnik salvo

Russia's territorial collapse over four weeks is the strategic context in which the Oreshnik escalation occurred: military failure driving weapons spectacle.

Occurred 24 May 2026

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ISW: Russia lost ground; new axis opens

The 91 sq mi net loss to 9 June extends the stall pattern ISW had already recorded showing Russia net-lost 100 sq mi in the four weeks to 26 May.

Occurred 9 Jun 2026

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Different Perspectives

Turkiye

Erdogan followed the Pakistani delegation to Jeddah for an instrument that has not been signed. Ankara's entry widens Saudi Arabia's defence architecture beyond the existing Pakistan pact, adding a second non-Gulf military partner mid-conflict.

Oman

Muscat is the corridor's broker but has published nothing about the arrangement Fars describes on its behalf. The account leaves Oman administering outbound traffic only, a narrower role than the shared route its mediation has rested on since 1979.

Pakistan

Islamabad sent Sharif, Munir and Dar to Jeddah to widen a defence commitment it has honoured in cheaper registers since March, when Dar invoked the Saudi mutual defence pact. Jeddah tests whether that hedge becomes a binding trilateral instrument with Turkiye.

United States

Washington rejected the Majlis Hormuz bill outright while CENTCOM's own tally kept climbing to 49 vessels redirected since 14 July. Both instruments tightened in the same week Trump promised the strait would reopen soon.

Iran

Iran's foreign ministry is selling a phased Hormuz corridor through Oman and denying any percentage cargo tariff, while its own Majlis is legislating fines to 20% and a bar on Israeli-linked cargo. The two accounts, from the same government, do not agree with each other.

Saudi Arabia

Riyadh published a target forecast, not an attribution, for the campaign it says the Najran strike previewed. That keeps an Article 51 case available while it formalises a trilateral defence architecture with Pakistan and Turkiye.