US-Iran Ceasefire on Shaky Ground: Oil, Bonds, and Markets Hang on Trump’s Approval

The US-Iran conflict that began in early spring 2026 has morphed into a grinding diplomatic stalemate punctuated by military strikes and market-rattling headlines. A tentative ceasefire is technically in place, but its future depends almost entirely on a single approval — and oil, bonds, and European rate expectations are vibrating on every whisper from the negotiating table.

Where the Ceasefire Actually Stands

The United States and Iran agreed to a two-week ceasefire on April 8, 2026, mediated by Pakistan . That initial truce has since expired, and both countries have been negotiating a 60-day extension. By late May, negotiators had reached an outline agreement — described as a 60-day memorandum of understanding — that would extend the ceasefire and launch talks on Iran’s nuclear program, but the deal still requires President Trump’s formal sign-off .

Trump described the odds of finalizing a deal as “50/50” . A senior Iranian official confirmed that the draft requires a 60-day ceasefire across all fronts, including Lebanon . The White House, however, has not confirmed signing, and as of May 28, the Strait of Hormuz remained closed with the US naval blockade still in effect .

Several key friction points remain unresolved. Iran wants an immediate lifting of the blockade, a reopening of Hormuz shipping, and the eventual formation of a UN resolution . The US insists on addressing Iran’s enriched uranium stockpile — described as the “single unbridgeable issue” . Analysts have characterized the draft memorandum as a time-buying mechanism rather than a genuine peace deal .

Oil Prices: A Market Held Hostage by Headlines

Crude has been whipsawing sharply on each fragment of ceasefire news. In the last full week of May, the global benchmark Brent crude settled at $103.54 a barrel on May 22 , then fell 5.5 percent to $97.90 on May 25 when hopes for a deal brightened . By May 28, prices settled mixed as conflicting reports — one suggesting an outline agreement, another noting Trump had not yet approved it — left traders uncertain .

Earlier in May, Brent spiked above $114 a barrel after a cruise missile attack on the UAE’s Fujairah oil hub raised fears of wider escalation . The Strait of Hormuz, through which roughly 20 percent of global oil supply transits, remains closed — and that closure is the core supply-side risk underpinning the war premium embedded in every crude price .

Several sources indicate that even if a deal normalizes shipping, prices are unlikely to return to pre-war levels quickly. Goldman Sachs projected Brent at $90 per barrel by end of 2026, roughly $20 above pre-war levels, even under a normalization scenario .

European Bond Yields: The Peace-Rate Seesaw

Euro zone government bond yields have moved almost perfectly inversely to ceasefire optimism. The dynamic is straightforward: when peace looks closer, energy costs are expected to cool, dialing back inflation fears and reducing the pressure on the European Central Bank to hike rates aggressively. When talks stall, yields jump.

• May 28: Yields declined as Axios reported that the US and Iran had reached a 60-day ceasefire framework, and markets trimmed ECB rate-hike bets .
• May 12: Yields rose sharply after peace hopes collapsed. Trump said the ceasefire was “on life support,” and markets priced in three ECB rate hikes for the year — the most hawkish positioning of the month .
• May 5–6: Yields edged lower, with Germany’s 10-year benchmark — the euro zone’s reference rate — down about 1 basis point as oil prices softened .

The Bundesbank’s May 2026 monthly report noted that risk appetite and equity valuations recovered markedly after the initial April ceasefire, though it cautioned that the most adverse energy-price scenarios remained in play .

ECB Inflation Expectations and Rate Pricing

Money markets as of late May were pricing in two ECB rate hikes by year-end, down from three in mid-May . The deposit rate was priced at roughly 2.59 percent by December, down from 2.75 percent earlier in the month . The trajectory has reversed earlier consensus: before the war, investors had expected stable ECB rates; the conflict’s energy shock introduced upward inflation pressure that forced a repricing .

ECB board member Isabel Schnabel indicated the central bank should raise rates in June even if a deal materializes, underscoring that the inflation risk is not solely a function of geopolitics .

Broader Markets: A Relief Rally That Couldn’t Stick

Global equities staged a classic relief rally on the initial April ceasefire, led by energy-reliant sectors and countries . That bounce faded as talks stalled and military strikes resumed. The euro briefly strengthened on ceasefire optimism before weakening again on renewed uncertainty . Longer-term sovereign bond yields remained elevated despite the ceasefire’s announcement, driven largely by expectations of higher short-term rates .

Trump’s Approval Ratings: Historic Lows

The conflict has inflicted clear political damage on President Trump. Polling across May 2026 shows:

• A Marist Poll put Trump’s overall approval in the high 30s, with 60 percent disapproving of his handling of Iran specifically — up from 54 percent in March .
• A Reuters/Ipsos poll (May 11) found 36 percent approval, a slight uptick from the lowest point of his term .
• A Fox News poll (May 20) recorded 71 percent disapproval of Trump’s handling of the economy, with 60 percent opposing continued US military involvement in Iran .
• A Washington Post/ABC/Ipsos poll (May 3) registered 62 percent disapproval — the highest of his presidency — as US gasoline prices hit a four-year peak .
• Just 32 percent approved of Trump’s handling of the war itself in a Marquette Law School survey from April .

The war has undercut what is normally a rally-around-the-flag effect for presidents. Net support for the conflict has fallen to -22.8 percentage points in the Silver Bulletin polling average, down sharply from roughly -9 points at the start of the war .

For markets, every new ceasefire headline is a reminder that the single biggest variable remains human judgment — a presidential decision that, for now, is stuck at 50/50 odds.