The European Central Bank has not raised rates yet. But it has opened the door. At its latest meeting, the ECB kept the deposit rate unchanged at 2%, choosing patience over panic. Officially, the Governing Council still lacks sufficient verified information to assess the full impact of the Iran war, the Hormuz blockade, and the surge in energy prices. Unofficially, the direction is becoming harder to hide. Unless energy prices ease meaningfully or the war moves towards a credible end, a rate increase in June is now the working assumption. Christine Lagarde’s message was deliberately careful, but not neutral. She said the next six weeks would be the right moment to assess the economy with updated data and fresh projections. That is central bank language for: April was too early; June may not be. Policymakers debated a hike this week and rejected it unanimously, but the fact that it was discussed “long and deeply” matters. The ECB is no longer debating whether the shock exists. It is debated whether it has become durable enough to require action.

The problem is that Europe is facing precisely the kind of shock central banks dislike most. Inflation has jumped to 3%, its highest level since 2023, driven by oil and gas. Brent has already moved beyond the ECB’s adverse scenario, which assumed prices close to $120 a barrel this quarter, while the baseline was built around oil at roughly $81. For the moment, Lagarde insists there is no convincing evidence of second-round effects. Wages and broader prices have not yet fully absorbed the energy shock. But the longer Hormuz remains disrupted, the less reassuring that distinction becomes. At the same time, growth is fading. Euro-area GDP rose only 0.1% in the first quarter. France has stalled. Germany has cut its growth expectations. Companies are preparing for weaker demand. Households are being squeezed by energy costs. The ECB refuses to use the word “stagflation”, arguing that it belongs to the 1970s. Technically, perhaps. But politically and economically, the smell is already in the room: weaker growth, higher inflation, and a central bank forced to choose which pain it prefers to amplify.

This explains the hesitation. A June hike would defend credibility against inflation, but it would also tighten financial conditions in a slowing economy. No hike would protect growth in the short term, but risk convincing markets that the ECB is once again behind the curve. After the Ukraine shock in 2022, when the ECB reacted too late, and after the 2011 mistake, when it raised rates into the sovereign-debt crisis and then had to reverse course, Frankfurt knows the cost of both delay and excess zeal. Markets have already made their judgment. Investors are pricing a June hike and roughly three-quarter-point increases by year-end. The ECB itself appears less aggressive than the market, but the direction is clear: if the conflict persists, avoiding a move becomes difficult. Some officials still argue that a sharper economic slowdown could prevent a June hike, but others see that as a low-probability outcome. In their view, the economy is deteriorating, but not yet enough to justify ignoring inflation.

The real variable is not Frankfurt. It is Hormuz. If the Strait reopens, if oil prices retreat, and if gas markets normalise, the ECB can claim victory by doing nothing. If the war drags on, the central bank will be pulled from hesitation into action. Not because Europe is strong, but because inflation will look too dangerous to tolerate. That is the cruel geometry of this crisis. The ECB is not steering the cycle. It is being dragged behind a geopolitical shock it cannot control. And June may be the moment when patience stops looking prudent and starts looking late.