Barely had the announcement of a peace agreement taken place than the markets took a deep breath. The stock markets all spent the session in the green while oil, American WTI or Brent from the North Sea began to fall by around 5%, placing them around 80 dollars per barrel. For the markets, scalded by the record of 120 dollars per barrel reached in April, it is relaxation; aeronautics and automobile companies saw their shares appreciate significantly. Beyond the markets, entire countries are feeling immense relief. For hydrocarbon-exporting Gulf countries, cumulative supply losses already exceeded one billion barrels at the end of May, according to the International Energy Agency. Iraq, for example, derives 90% of its revenue from its crude oil exports. The hydrocarbon-importing countries of the Middle East are also reassured. Asia, in particular, which is the recipient of 8 million barrels of oil out of the twenty that usually cross the Strait of Hormuz daily, was in difficulty. But all is not yet for the best in the best of all possible worlds. Tehran has not given up on its idea of ​​taxing ships crossing the Strait of Hormuz, ignoring international law. Iran has even taxed certain ships from countries that are not hostile to it, around $2 million per tanker, to let them pass through the zone. With 32,000 ships having passed through the Strait of Hormuz in 2025, Iranian state television estimates, this could represent a windfall of $64 billion per year - at least. But neither the United States nor the members of the G7 want to hear about it. The maneuver would increase the cost of black gold and could inspire other countries bordering maritime straits, believes Emmanuel Macron in particular.