Russia expects to run at least $28bn over budget on its Ukraine war spending this year as advances slow and Kyiv gathers momentum with strikes across the border.

A letter from finance minister Anton Siluanov in February urged the cabinet to freeze around ₽2.9 trillion Russian roubles ($40.8bn) in planned non-war-related spending this year, warning that the ₽2trn overspend could rise to as much as ₽4trn in a “negative scenario”, according to the Financial Times.

Mr Siluanov also anticipated that Russia would overspend on the war by a further ₽4trn in 2027 and 2028.

While sources close to Vladimir Putin say the president still believes his forces can take all of Donetsk and Luhansk by the autumn, the woeful financial situation shows the difficulty Russia is running into after more than four years of bitter conflict with an emboldened Ukraine.

With ₽16.84trn set aside for defence and security, worth around two-fifths of this year’s budget, Moscow anticipated a budget deficit of ₽3.8trn this year.

But that figure had already swollen to ₽5.9trn by April, according to the FT, in what would be Russia’s largest deficit since the full-scale invasion in 2022.

Russia was the world’s 11th largest economy at the outset of war but had climbed to ninth last year in spite of sanctions and war costs, buoyed by expansions in defence, industry and procurement.

While inflated oil prices linked to the Iran war have helped to keep Russia afloat since Mr Siluanov’s February warning, the war economy is showing signs of strain as public services and manpower deplete.

Putin told government officials earlier this month that measures taken to boost the economy were starting to yield results after Moscow was forced to slash its economic growth forecast for this year. He said economic data for March was positive, with GDP up 1.8 per cent.

But Mr Siluanov told Russian newspaper Kommersant on Wednesday that the finance ministry was revising the budget to account for “changes in macroeconomic conditions [and] the need to concentrate additional resources on important priority areas”.

“Of course, there are absolute priority spending items: fulfilling social obligations and ensuring the country’s defence and security,” he said. “Otherwise, we analyse each item for economic return, achievement of results and, ultimately, its impact on people’s wellbeing.”

Mr Siluanov suggested further cuts could still be on the cards: “Reserves are not infinite. We cannot afford any financial slack in the face of such large-scale global transformations. No one will give us any breaks.”

Forecasts by Russia’s economy ministry earlier in May lowered estimates ​for ​GDP growth in 2026 to 0.4 per cent from ​1.3 per cent and cut ​estimated ⁠growth in 2027 to 1.4 per cent from 2.8 per cent. Growth was expected ⁠to ​reach 2.4 per cent ​in 2029.

Meanwhile, Russia’s rate of advance in Ukraine has significantly slowed in 2026 compared to how it fared last year. The Institute for the Study of War, an American advocacy think tank, assesses that Russian forces seized 104sq km in Ukraine between the start of the year and 26 May, compared to 1,619sq km taken in the same time period in 2025.