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Russia loses 100 sq miles in four weeks

3 min read

15:37UTC

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

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This Event

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Led to

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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.

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Different Perspectives

Shipping and insurance underwriters

Kpler counted five Hormuz transits on 16 August against 31 the previous weekend, while Windward logged four vessels going AIS-dark for up to a month; underwriters price both the attacks and a sanctions register that names their counterparties in unreadable scanned images. Two trackers now measure only the ships that consent to be seen.

China

China sits at the end of the payment chain the 14 August designation targets: Iran's shadow banking network exists to convert sanctioned oil sales, much of it to Chinese refiners, into usable funds. Beijing has previously refused to recognise OFAC's jurisdiction over its own entities buying Iranian crude, leaving this designation to test compliance rather than change trade.

Qatar

Qatar's foreign ministry denied on 16 August holding any Iranian pilots alive, contradicting Iranian General Mohammad Bagherzadeh's claim that Doha holds three Su-24 aircrew, and said it had recovered only one set of remains. Qatar carries Iran's messages to Washington, and this is a public break with Tehran over a fact only one aircrew inquiry can settle.

Oman

Oman's shipping-map talks, covering monitoring, environment and maritime services, were publicly decoupled from any Hormuz reopening by Iran's own foreign minister on 17 August. Muscat's mediation channel keeps functioning on the narrow file it was given, while the political decision it hoped to unlock stays with Iran's security council.

Saudi Arabia

Saudi Arabia separately called the recurrence of tanker attacks on Emirati shipping a dangerous escalation, breaking from the UAE's repeated formula. Riyadh speaking in its own name over an attack on another state's vessels signals it reads the pattern differently from Abu Dhabi's flat statements.

United Arab Emirates

The UAE foreign ministry condemned a third ADNOC-linked tanker attack on 15 August in language identical, word for word, to its statement the day before. Three consecutive strikes on Emirati shipping have not moved Abu Dhabi's public wording by a single adjective.