Over the past several months, oil has become one of the most important factors influencing the global economy. Between the war with Iran, attacks on energy infrastructure, and now a controversial agreement involving Russian diesel, rising energy prices are complicating everything from inflation and interest rates to foreign policy.

The war with Iran has created significant disruptions to global oil supplies, particularly around the Strait of Hormuz, where roughly 20% of the world’s oil consumption normally passes through.¹ Recent attacks on oil tankers and Riyadh’s international airport have added to concerns that the conflict could spread further into Saudi Arabia, one of the world’s largest oil producers.²

Oil prices have responded, with Brent crude climbing above $105 a barrel on October 12.³ The longer these disruptions continue, the greater the risk that higher energy prices become a more persistent problem for the economy.

Why Oil Is Such a Big Inflation Problem

When oil prices rise, the impact goes well beyond what we pay at the gas pump. Trucking companies pay more to transport goods, airlines spend more on fuel, and manufacturers face higher production and shipping costs. Many of those expenses eventually get passed along to consumers through higher prices for everyday goods and services.

This creates a difficult situation for the Federal Reserve. The Fed can raise interest rates to slow spending and bring down inflation, but it can’t produce more oil or reopen shipping routes. If energy prices remain elevated, inflation could stay higher for longer, making it more difficult for the Fed to lower interest rates.

Now Russia Is Part of the Equation

On October 9, President Trump announced an agreement with Russian President Vladimir Putin to release Russian diesel into U.S. and global markets in an effort to bring down fuel prices. The administration also temporarily eased restrictions on Russian diesel imports.⁴

Diesel prices have risen dramatically since the Iran war began, reaching approximately $6.28 per gallon, an increase of nearly 70%.⁴ This matters because diesel powers much of the transportation industry, and higher transportation costs can eventually affect prices throughout the economy.

The agreement has been met with significant criticism. The U.S. has restricted Russian energy imports since Russia invaded Ukraine in 2022, partly to limit the revenue available to fund the war. Allowing Russian diesel back into the market could provide Moscow with additional income, while Ukraine has spent years targeting Russian refineries to weaken Russia’s ability to sustain its military operations.⁵

Trump also announced a potential energy ceasefire between Russia and Ukraine, although Ukrainian officials disputed whether an agreement had been reached. Meanwhile, energy experts are skeptical that the amount of Russian diesel being discussed would be enough to meaningfully lower global fuel prices.⁵ ⁶

What makes this particularly interesting is how much influence oil prices are having on foreign policy. The U.S. wants to bring down energy costs, but doing so may require decisions that conflict with other geopolitical priorities.

What This Means for Investors

Higher oil prices can benefit energy producers, but they create challenges for many other businesses. Airlines, transportation companies, and manufacturers face higher expenses, while consumers have less money available to spend elsewhere.

The bigger concern for the stock market is inflation. If elevated oil prices prevent the Fed from lowering interest rates, borrowing costs could remain higher for longer, putting pressure on economic growth and stock valuations.

I don’t think this is necessarily a reason to become bearish on stocks or make a major investment in energy. Corporate earnings and long-term economic growth still matter, and markets have historically managed through periods of geopolitical uncertainty.

What concerns me more is the possibility that energy prices remain elevated for an extended period. A temporary spike in oil can create volatility, but sustained higher prices can gradually affect corporate profits, consumer spending, and inflation.

My takeaway is that oil has become one of the biggest uncertainties facing investors today. Until we see more stability in the Middle East and a clearer path toward resolving these conflicts, energy prices will likely remain an important factor in determining where inflation, interest rates, and the stock market go next.

At Maddahi Wealth, we help our clients navigate changing market conditions while staying focused on their long-term financial goals. If you’re looking for a more thoughtful, personalized approach to managing your wealth, we’d love to connect. Visit our website to learn more about our business and to apply to be a client.

Sources

1. TIME, October 11, 2026. What to Know About Trump’s Russia-Ukraine Energy Ceasefire Claim.
2. Reuters, October 11, 2026. One Dead in New Attack on Saudi Airport, a Day After Houthi Strike Kills 13.
3. Reuters, October 12, 2026. Oil Prices Rise as Attacks on Saudi Arabia Overshadow Trump’s Russian Supply Announcements.
4. Reuters, October 9, 2026. Trump Says Russia to Supply Diesel to U.S. and Global Markets.
5. PBS NewsHour, October 9, 2026. Trump Strikes Deal With Putin for Russian Diesel.
6. The Guardian, October 11, 2026. Trump’s Deal With Putin Will Have Little Impact on U.S. Diesel Prices, Experts Say.