How the US-Iran Ceasefire Collapsed Oil Prices and Upended the ECB's Tightening Plans

The European Central Bank's rate trajectory has flipped in a matter of weeks. A ceasefire between the US and Iran that reopened the Strait of Hormuz sent Brent crude falling back to pre-war levels near $73 per barrel, removing the very energy shock that justified the ECB's first rate hike since September 2023. Markets now see a 94% implied probability that the Governing Council will hold rates steady at its July 23 meeting , and ECB officials — including hawkish member Martins Kazaks — appear to be shifting toward a wait-and-see posture.

This article fact-checks what Kazaks actually said, traces the oil price collapse, and examines how the energy shock's reversal has reshaped inflation risks and market expectations for the eurozone.

What Kazaks Actually Said (And What Remains Unconfirmed)

No direct transcript of a Sunday June 28, 2026 speech by Martins Kazaks was found in available sources. The assistant's initial answer noted this explicitly, and no subsequent search retrieved a verified quote from that date. The claim that Kazaks said the probability of negative economic scenarios has "fallen massively" or that the Council can "move gradually and assess incoming data" could not be independently sourced from this search. The most authoritative ECB source remains the June 11 press conference statement .

Kazaks' most recent verifiable remarks come from May 14, 2026, when he told Latvian public broadcaster LTV: "Oil prices are higher, we see that it's gradually starting to push inflation up, and if inflation expectations start to deteriorate, then the ECB will be forced to raise interest rates" . This was a conditional warning — a hike would only be necessary if oil prices de-anchored inflation expectations, a precondition that has now been reversed.

Earlier, on April 22, 2026, Kazaks struck a more cautious note, saying the ECB has the "luxury" to wait on rate rises given "very high" uncertainty from the Middle East conflict . He stated: "We are not in a rush. We still have the large luxury of collecting data and forming our view. But if necessary, we will of course move."

What is verifiable from market commentary: The Polymarket page, updated June 29, states that "Recent ECB communications and the June 11 decision… underpin the 94% market-implied probability of no change at the July 23 meeting" . This suggests that post-June 11 communications from the ECB — possibly including Kazaks — have been interpreted by traders as dovish-leaning, even if a specific Sunday transcript is unavailable.

The Oil Price Collapse: From War Premium to Pre-War Levels

Deal Chronology

• June 14-15, 2026: A preliminary US-Iran agreement to end the war and reopen the Strait of Hormuz was announced .
• June 17, 2026: A formal pact was signed, suspending US sanctions and allowing Iranian oil exports to resume .
• June 19, 2026: Tankers began moving through the Strait of Hormuz .

Brent Crude Price Path

• Pre-war level (Feb 27, 2026): ~$72 per barrel .
• Post-war peak (mid-2026): Briefly pushed above the mid-$80s, with the "war premium" estimated at $10-$15 per barrel .
• June 24-25, 2026: Brent fell to ~$73 per barrel, its lowest level since before the Feb 28 start of the Iran war . On June 25, Brent settled at $73.74, down 4.3% .
• June 26, 2026: Brent traded around $72, effectively wiping out nearly all gains made since the conflict began .

The EIA's Short-Term Energy Outlook noted that the Brent price decline followed "reductions in oil demand and reports of a possible agreement between the United States and Iran" .

Market Expectations for the July 23 ECB Meeting

As of June 29, 2026, the Polymarket prediction market showed a 94% implied probability of "No change" — meaning the deposit facility rate stays at 2.25% — at the July 23 Governing Council meeting . The only other outcome with measurable probability was a 25 bps increase at 5%. The ECB Watch tool, using a different methodology, showed an 89.0% probability of no change as of June 24 .

This represents a dramatic shift from the pre-ceasefire environment. Before the June 11 meeting, futures data compiled by Bloomberg implied a roughly 97% likelihood of a 25 bps hike . A Reuters poll found more than 90% of economists expected the June increase, and 60% expected an additional rate increase in 2026 . That second hike now appears largely priced out.

How the Oil Collapse Undermines the ECB's Tightening Rationale

The ECB's June 11 decision to raise the deposit facility rate by 25 bps to 2.25% was explicitly driven by the Middle East war generating inflation pressures . The bank's new staff projections, released with that decision, showed:

• Headline inflation expected to average 3.0% in 2026
• Inflation forecast at 2.3% for 2027

Both projections were based on the energy shock from the Iran war. With Brent crude collapsing back to pre-war levels, the primary inflationary catalyst that justified the June hike has been removed. The Polymarket summary notes that "Recent ECB communications… underpin the 94% probability of no change," reflecting markets pricing out further hikes as the energy shock subsides .

In an April 30 press conference — before the June hike — an ECB official was asked directly whether a quick end to the war and a sharp fall in energy prices would change the rate outlook . The ECB replied that it had decided to keep rates unchanged at that meeting, leaving the door open for a conditional June hike that could be abandoned if conditions changed . That condition has now been met.

Key Unanswered Questions

The most significant gap in this analysis is the absence of a direct Sunday June 28 Kazaks speech that could confirm or refute the user's specific claim that he said negative economic scenario probabilities have "fallen massively." The ECB's next scheduled communication is the July 23 meeting decision and press conference.

Additionally, specific forecast updates from Oxford Economics and other sell-side analysts were not directly retrieved in this search. Their updated models would likely show a reduced probability of further ECB tightening, but this cannot be confirmed from available sources.

Bottom Line

The convergence of a confirmed US-Iran ceasefire, oil prices returning to pre-war levels, and market-implied probabilities near-certainty for a July hold paints a clear picture: the ECB's tightening cycle has likely peaked at 2.25%. Whether the Council moves to cut rates later in 2026 will depend on whether the energy shock's reversal flows through to core inflation and wage data — a process that will take months to play out.