The US Treasury secretary has announced the launch of what he describes as the “largest financial attack in history” against Iran, warning that countries that, according to Washington, assist Tehran will have to pay the price of economic isolation. The stated objective is to cut Iran’s financial and trade lifelines and restrict the channels connecting its economy to foreign trade. The meaning of the threat is clear: Washington wants to extend economic pressure beyond Iran to its network of trading and financial partners.

But precisely as the US speaks of cutting Iran’s economic lifelines, a fundamental question arises: How far can this pressure continue without part of its cost returning to the US economy itself?

The chart showing US crude oil reserves provides an important answer to this question. Including the Strategic Petroleum Reserve, US oil reserves in July 2026 represented roughly 41 days of consumption coverage, compared with the historical average of about 65 days shown in the chart. The 24-day gap from that average means the reserve safety margin is roughly 37% below its historical average. This places reserves at one of their lowest levels in recent decades and within an unusually low range not seen in roughly half a century.

Of course, “41 days” does not mean the US will run out of oil after that period. The significance of the figure lies in the size of the safety margin. The smaller that margin becomes, the more limited the economy’s ability to absorb a prolonged supply shock.

This becomes more significant when low US reserves are considered alongside the situation in the Strait of Hormuz. Hormuz is one of the world’s most important energy chokepoints, and disruption to tanker traffic can expose global markets to supply shortages, higher shipping and insurance costs, and rising prices for oil and refined products. Under such circumstances, although the US is a major oil producer, it is not immune to a global energy price shock.

In fact, the more vulnerable part of the US economy may not be crude oil but refined petroleum products. Higher gasoline, jet fuel and, particularly, diesel prices are transmitted directly into the real economy. Diesel powers trucks, agriculture, industrial machinery and a significant part of the goods supply chain. Therefore, the longer disruption in Hormuz persists, the greater the likelihood that the energy shock will feed into transportation costs, commodity prices, production costs and US inflation.

This is where Scott Bessent threat against Iran becomes a paradox when viewed alongside the US economic situation. Washington wants to increase the cost of resistance for Tehran by closing Iran’s financial and trade channels. But if that pressure intensifies tensions in energy markets, part of the same pressure will return to the US economy through higher oil and refined-product prices. In other words, sanctions intended to restrict Iran’s economic lifelines could also place pressure on the economic lifelines of the US through global energy markets.

For the US government, this is not merely a pricing problem. Higher energy prices mean greater inflationary pressure, and higher inflation can make interest-rate cuts more difficult. Under such circumstances, the cost of financing the US government also becomes more important, particularly in an economy facing enormous debt of $400 trillion and a continuing need to issue Treasury securities to finance budget deficits and refinance maturing debt.

The US bond market becomes one of the sensitive pressure points under such conditions. If the energy shock persists and inflation expectations remain elevated, investors may demand higher yields to hold longer-term bonds. Higher bond yields mean higher borrowing costs for the government and, if sustained, greater fiscal pressure on the US budget.

For this reason, the financial war against Iran should not be viewed separately from the energy war and the financial condition of the US. Washington faces an economy that, on one hand, possesses significant sanctions power and broad access to the global financial system, while on the other must manage energy costs, inflation, interest rates and its own debt.

Maximum pressure is an advantage when the cost of imposing it remains low for the party applying it. But if economic pressure coincides with a prolonged energy shock, the equation changes.

The central issue in such a confrontation, therefore, is not merely the ability to strike, but the resilience required to withstand the cost of that strike. A country whose energy reserves have fallen to one of their lowest levels in recent decades, whose refined products are facing price pressures, and whose bond market must contend simultaneously with inflation, debt and financing costs cannot afford to ignore the cost of economic war.

This is Washington’s paradox. The US wants to tighten the financial noose around Iran and restrict the channels through which the Iranian economy breathes. But the more tightly it pulls that noose and the longer the economic war continues, the greater the possibility that the pressure will also be transmitted to its own economy. Tightening the noose does not squeeze only Iran’s throat; if the war becomes prolonged, it could also constrict America’s economic breathing room.

Under these circumstances, the decisive question is not whether the US has the ability to exert financial pressure on Iran. The question is which side — Iran or the US — can withstand the cost of that pressure for longer. Oil reserves, diesel prices, the Strait of Hormuz, inflation and the bond market are all becoming components of a larger test: the test of resilience.