President Donald Trump said Monday that the cease-fire and peace deal with Iran has ended.

The decision creates immediate uncertainty for global energy markets. Because the end of the deal raises fears that the Strait of Hormuz could be blocked, fuel costs may rise and increase inflationary pressure on Canadian households.

Market reactions following the announcement have been volatile. Some reports indicate that oil prices spiked during a primetime address by the president on the conflict. Conversely, other data shows U.S. crude oil futures fell more than 15 percent [1] after Trump suspended attacks on Iran. In other instances, Brent and WTI crude futures each declined about five percent [2] after the president said the Iran deal was complete.

Canadian analysts are monitoring the situation closely as the Strait of Hormuz remains a critical chokepoint for oil tankers. If the waterway is obstructed, the resulting supply shock could drive prices higher, potentially benefiting oil producers but hurting consumers at the pump.

To address potential economic imbalances, some suggest a windfall tax on big oil companies. Such a measure could raise up to $46 billion [3] over the next year.

These developments follow a period of diplomatic movement, including an official signing ceremony for a U.S.–Iran deal that was expected on June 19 [4] in Switzerland.

President Donald Trump said Monday that the cease-fire and peace deal with Iran has ended.

The collapse of the Iran peace deal introduces significant geopolitical risk to the global energy supply chain. For Canada, this creates a dual-economic tension: while higher global crude prices can increase revenues for the domestic energy sector, the resulting inflation in fuel and transport costs threatens the purchasing power of average consumers.