Three weeks ago this looked like a closed chapter. On June 18, the U.S. and Iran signed an agreement to end the conflict and reopen the Strait of Hormuz, and oil did exactly what you'd expect peace to do. Brent crude fell below $71 a barrel on July 1, back to where it was sitting before the war even started in February. Traders moved on. Energy stocks cooled off. The story seemed finished.

Then it wasn't. By July 23 Brent had crossed $100 a barrel, a jump of more than 30% in a single month. The trigger was a wave of renewed strikes, with U.S. Central Command carrying out its 13th consecutive night of attacks on Iranian targets, and Houthi militants striking two Saudi oil tankers in the Red Sea. Trump told reporters he was considering a massive attack on Iran, calling it bigger than anything before. The ceasefire didn't collapse loudly. It just quietly stopped being true.

Here's the part that makes this a bigger story than just oil. In the exact same week that Brent was rocketing back toward triple digits, the Trump administration let its 10% global tariff expire at midnight on July 24 and immediately replaced it with something more permanent. New tariffs of 10% to 12.5% now apply to 60 trading partners, covering roughly 99% of everything the U.S. imports, from the European Union and Japan to Canada, India and China.

This time the White House isn't calling it emergency trade policy. Trade Representative Jamieson Greer framed the new duties as a response to forced labor practices, using a legal authority called Section 301 that's built to last far longer than the temporary orders Trump leaned on earlier this year, several of which were struck down by the Supreme Court. Greer told lawmakers the administration's approach hasn't changed, only the legal tool behind it. In plain terms, tariffs just went from something markets hoped was temporary to something built to stick.

Put these two things side by side and you get a problem most retail investors aren't pricing in yet. Oil going up means transportation, shipping and manufacturing costs rise almost everywhere, and that shows up at the gas pump and in the price of anything trucked to a store. Tariffs going up means the goods themselves cost more before they even leave the factory. Normally you'd hope one of these pressures eases while the other calms down. Right now both are moving the same direction at the same time.

This matters even more because the Fed, under Kevin Warsh, already held interest rates steady through June rather than cutting, partly because inflation from the earlier phase of the Iran conflict pushed energy costs up 23% year over year. If oil and import costs climb together again, Warsh has even less room to cut rates later this year, and markets that were hoping for relief could be waiting a lot longer than expected.

The oil story goes deeper than the Middle East. The Caspian Pipeline Consortium, which handles roughly 80% of Kazakhstan's crude exports, suspended loadings at its Black Sea terminal after tanker attacks tied to the Russia-Ukraine war. Asian buyers who normally rely on Saudi crude are already discussing rerouting shipments around Africa through the Suez Canal instead of the shorter path through the Gulf, which adds weeks of transit time and cost.

Analysts at RBC have floated the possibility that Brent could climb past the 2022 high of $128 a barrel, and in a worst case scenario touch the 2008 peak of $146, if the conflict escalates into a full regional war. Nobody is forecasting that as the likely outcome. But the fact that serious desks are even modeling it tells you how fast sentiment has flipped from "this is over" to "this could get much worse."

With 20 years of investment expertise, Caleb Gan is a seasoned professional in stock trading. The hard work and dedication were recognized when his partner and him were featured on Singapore TV Channel 9's MoneyWeek, a prominent financial program. He's also had the privilege to share insights on radio stations like 93.8Live, Capital 95.8FM, and 96.3FM through live interviews about stock market investments. Beyond that, he's also the co-founder of NDU System, where he continues to help others navigate the world of trading.

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