War may be technological, but its bills remain old-fashioned. Ukraine needs tens of billions of dollars beyond what was planned, while Europe shifts from an emergency aid logic to financial rationing. In a prolonged war, a budget deficit can be just as dangerous as a missile shortage.
In discussions about Ukraine's ability to continue the war, soldiers, drones, missiles, and artillery shells are usually counted.
Much less frequently - money.
This is the issue highlighted by military analyst Delwin (@DelwinStrategy): Ukraine's additional budget need for 2026 is estimated to be between $25-40 billion.
Even the lower bound is massive. The upper bound signifies the emergence of a financial gap that Kyiv is practically unable to close on its own.
This is one of the most unpleasant features of War 4.0.
Production of FPV drones can be scaled. Additional people can be mobilized. Power plants can be repaired after another strike.
But in the end, someone has to pay for all of this.
Energy burns money
The first source of additional costs is obvious - the energy system.
Every major wave of strikes creates a double bill.
First, the state and companies must repair damaged transformers, substations, generating capacities, and networks. Then there is a need to compensate for what cannot be quickly restored: importing electricity, purchasing fuel, installing backup generation, and protecting surviving facilities.
A missile strikes once.
The economy pays for it for months.
This is why Russian strikes on energy have a much broader goal than just leaving cities without light. They create a constant financial tax on the functioning of the Ukrainian state.
And this tax accumulates.
Less light - less taxes
The second half of the problem is even more unpleasant.
Damage to infrastructure simultaneously increases state spending and reduces state revenues.
A company operating only a few hours a day produces less output. A business forced to buy generators and fuel has less profit. Some enterprises reduce operations or relocate. Part of the economic activity goes into the shadow.
The result arrives at the Ministry of Finance in the form of weaker tax revenues.
A classic military spiral emerges.
The state has to spend more just when its ability to collect money deteriorates.
In a peaceful economy, such a problem can be solved by cutting expenses or raising taxes.
In a warring country, the choice is significantly smaller.
The army cannot be sent on unpaid leave until the next quarter.
The Western ATM has a limit
During the first years of the big war, a quite rational assumption formed in Kyiv: critical deficits would eventually be closed by partners.
So far, this model has mostly worked.
But it has created a dangerous illusion - that Western financial capability automatically means unlimited willingness of the West to pay.
These are not the same thing.
Europe is much richer than Russia. The USA is even richer. Theoretically, Western economies can finance Ukraine for a long time.
Politically, every subsequent billion becomes more complicated.
European states themselves need to sharply increase defense budgets, replenish ammunition stocks, and fund their own military industries. Washington increasingly insists that Europeans pay for a larger share of their own security.
Therefore, the question is gradually changing.
Not 'does the West have money?'
But 'how much of it is the West willing to give to Ukraine?'
€90 billion, but on schedule
The dispute over European funding of €90 billion has been telling.
For Kyiv, the logic is simple: if the money is already planned, part of it should be received earlier, when military and budgetary needs are at their peak.
Brussels responds with its own logic.
The money is earmarked for 2026-2027. Therefore, it must come according to the agreed schedule.
From an accounting perspective, everything is impeccable.
From a war perspective - absurd.
The Russian General Staff does not schedule strikes according to the EU's multi-year financial outlook.
This is where War 4.0 collides with Excel.
Russian money that isn't there
There was a beautiful solution to this problem.
€185 billion of Russian assets in Euroclear.
Politically, the scheme is almost perfect: non-European taxpayers finance Ukraine, not frozen Russian reserves.
But confiscating the principal amount faced legal, financial, and political risks. Belgium, where Euroclear is located, has many reasons to be nervous about the potential consequences.
Thus, an odd situation has arisen.
The money exists.
It is frozen.
It is located in Europe.
But Ukraine's budget cannot simply use it.
For Kyiv, the difference between a frozen billion and a missing billion is quite academic.
Neither can be spent.
Patriot is also accounting
The same is true for military aid.
Discussions about additional Patriot missiles illustrate the problem well: the deficit now exists not only in Ukrainian arsenals.
European countries and the USA are counting their own stocks.
Each missile sent to Ukraine is no longer seen as a unit from old stock that can be easily replaced. It is part of a limited resource needed by NATO itself.
War has gradually reached the depth of Western reserves where real competition for resources begins.
Kyiv needs Patriots to protect power plants.
Warsaw needs them to protect its own sky.
Washington needs them for a potential conflict in the Pacific.
A factory must resolve this dispute.
And the factory is running behind schedule.
Geo-economic zugzwang
As a result, Ukraine finds itself in a very uncomfortable construction.
To continue the war, it is necessary to simultaneously fund the army, support the civilian state, repair the energy system, import critical resources, and service an economy that operates far below its pre-war potential.
Domestic revenues are insufficient.
External funding is guaranteed only partially.
Russian assets remain legally blocked.
And military expenditures do not ask for permission from the budget calendar.
This is the financial mathematics of a long war.
A tank can be repaired.
A power plant can be rebuilt.
A new unit can be formed.
But a $40 billion deficit cannot be closed by patriotism.
The most deficient resource is time
This is why the main resource for Ukraine gradually becomes not even money.
But the time during which partners are willing to provide it.
If the war lasts another three months - a different financial model is needed.
If a year - another one.
If three years - a completely different one.
And each extension of the horizon increases the significance of the question that seemed almost secondary in the first months of war: who will pay for the next year?
Europe has not stopped supporting Ukraine. But it increasingly appears to be shifting from an emergency mobilization mode to a rationing mode.
Money will be available.
Missiles will be available.
Loans will be available.
But increasingly - a certain amount, for a certain time, and under certain conditions.
For a peaceful state, this is called budget discipline.
For a country waging a war of attrition, it is a financial drip.
And if the deficit estimate of $25-40 billion truly materializes, the main question of the fall will sound much more prosaic than all discussions about strategy.
Who will foot the bill?