The Plumb Line
2026-05-25 8 min read

Iran, Hormuz, and the Art of the Managed Stall

The Plumb Line

Sunday, May 25

"No rush." That's Donald Trump's framing for U.S.-Iran talks as of this morning — a notable step back from Friday's "largely negotiated." Secretary of State Marco Rubio is more direct: if the talks collapse, Washington will find "another way." Iran's foreign ministry is playing the same hedge from the other direction, saying "many issues" are resolved but warning a deal is not imminent. The two sides are, in Bloomberg's phrase, still "inching toward" an agreement that neither will formally claim.

Yesterday's brief called Trump's "largely negotiated" declaration a faster, more senior escalation than the back-channel path suggested. Today the front door is narrower. Trump has reinstalled ambiguity where he placed confidence yesterday, and Tehran is matching it. The read here is that this pattern is familiar from arms control diplomacy: once a principal-level statement has been made, a downgrade in tone is not a retreat from the substance — it is almost always a signal that the hardest remaining issues are now being negotiated in earnest. "No rush" means the terms are still live.

China's President Xi separately thanked Pakistani Prime Minister Shehbaz Sharif for mediating in the Iran conflict, Bloomberg reported this morning. That's a publicly logged acknowledgment of Pakistan's role as intermediary — the same back-channel we tracked last week through Army Chief Munir's Tehran visit. The read here: Beijing naming Islamabad as mediator out loud is not incidental. It is China protecting its investment in the diplomatic outcome.

Iran, Hormuz, and the Art of the Managed Stall

Three things happened in the past day that, read together, reframe where the U.S.-Iran negotiation actually stands. Trump said there's "no rush." Rubio said there's an alternative if talks fail. And Iran's supreme leader faces what Bloomberg describes as the toughest political test of his tenure — not because the talks are failing, but because a deal that requires nuclear concessions and Hormuz reopening could fracture the Iranian establishment that keeps Mojtaba Khamenei's authority intact.

The read here. The negotiation is not stuck on facts or timetables — it is stuck on domestic political sequencing on the Iranian side. Khamenei cannot sign a deal that his Revolutionary Guards, his hardline parliamentary bloc, and the institutions that profit from sanctions-era smuggling networks will read as capitulation. The pace Trump is now signaling — "no rush," days not hours — is not American impatience cooling. It is, almost certainly, Washington accommodating Tehran's need for internal alignment time. The historical parallel that fits here is the 2015 Joint Comprehensive Plan of Action (JCPOA) final stretch in Vienna: the last three weeks of those talks were consumed not by technical disputes over centrifuge counts but by Iranian domestic politics, specifically Supreme Leader Khamenei's need to give the Revolutionary Guards a face-saving off-ramp. The mechanism was the same: American negotiators slowed down publicly while Iranian intermediaries ran hard privately.

What I'd watch for next: if Iranian state media in the next 48 hours begins framing any deal as a *strategic victory* rather than a concession — if the language shifts from "we haven't agreed" to "we extracted these terms" — that is the signal the internal alignment is resolving. The falsifier for "this deal closes within a week" is a hardliner statement from the Revolutionary Guards explicitly rejecting the terms on the table. If that lands before Tuesday, the Vienna 2015 parallel breaks and we are back to a coercive track.

Three other things worth knowing

China launches Shenzhou 23, as the low Earth orbit race intensifies. China's Long March 2F rocket successfully carried the Shenzhou 23 crew to low Earth orbit yesterday, and overnight U.S. Space Force tracking catalogued four new Qianfan broadband constellation satellites — China's answer to Starlink. SpaceX's Starlink Group 10-47 mission has a launch window opening today from Cape Canaveral. The scoreboard as of this morning: SpaceX and China are both running active crewed programs and both are deploying broadband megaconstellations in parallel. The read here: the orbital competition is not hypothetical; it is occurring in real time above our heads.

Peter Murrell, former SNP chief executive and husband of ex-Scottish First Minister Nicola Sturgeon, pleaded guilty to embezzling £400,000 from the Scottish National Party, the Financial Times reported this morning. The conviction completes a collapse of the SNP's internal governance story that began in 2023 when Murrell was first arrested. The read here for Scottish independence politics is structural: the party that came closest to breaking up the United Kingdom is now processing a criminal conviction of its former operational chief. Leadership trust within the SNP will not recover on a short timeline.

Midwest flooding is not letting up, and the durations are now extraordinary. Flood warnings active since last night for Gibson and Knox counties in Indiana run through June 1 — more than a week out. Lawrence and Martin counties in Indiana carry warnings through May 29 and May 30. This is not a rain event; these are rivers that have crested and will stay elevated. What I'd watch for next: the agricultural disruption — late-spring flooding across Indiana's corn and soybean belt at planting season — will show up in futures pricing and crop insurance claims before it makes national news.

Echoes

The Pope's document lands in a specific tradition worth naming. This morning Pope Leo released a 42,300-word encyclical on artificial intelligence — the first papal document to treat AI as a primary subject rather than a footnote. The last time a pope issued a major encyclical specifically about a new economic and technological order was Paul VI's *Populorum Progressio* in 1967, which addressed industrialization and global development inequality. *Populorum Progressio* was dismissed in Washington and Brussels at the time as idealistic; twenty years later its framework for debt relief and development finance had become the baseline for G7 discussions. The historical lesson that applies: the Vatican's formal doctrinal statements have a longer operational shelf life than their initial reception suggests. A 42,300-word argument that AI should be "disarmed" to prevent it from dominating humanity is now part of the canonical record that governments, courts, and multilateral institutions will cite.

The quiet things

Israel remains publicly silent on the U.S.-Iran framework. Yesterday's brief flagged this as either diplomatic courtesy or prelude to a harder objection. Today's silence is one day longer. Finance Minister Bezalel Smotrich is demanding deterrence action against Iran over drone strikes, and Prime Minister Netanyahu is reportedly rebuffing him — meaning the Israeli government is managing its own internal tension while Washington manages Tehran's. The read here: a Netanyahu statement endorsing the deal's structure would resolve the ambiguity. Its continued absence does not.

The S&P Global Flash Purchasing Managers' Index (PMI) for May, reported in several wire pickups this morning, shows global business growth grinding to a halt — with Europe hit hardest, directly attributed to West Asian conflict disruption. The read here: this is the economic data point the Iran diplomacy story is not surfacing in its own coverage. A deal that reopens Hormuz is not just a geopolitical outcome, it is a European growth story. The European Central Bank will be watching the May PMI and the Hormuz timeline simultaneously.

How I'd act on this

If you trade energy or shipping — Hormuz tanker insurance rates and strait transit volumes are the leading indicators, not the press conference. Trump's "no rush" slows the bull case for a near-term oil price drop; the spread between Brent and the implied post-deal price is the trade right now.

If you follow European markets or hold European equities, the May PMI-plus-Hormuz combination is worth a close read. European shares climbed to two-month highs this morning on Iran-U.S. peace optimism, per the Economic Times. That rally is pricing a deal that hasn't closed. The downside is not priced.

If you cover Scottish or UK politics, Murrell's guilty plea is the closing chapter on the SNP governance story — but the opening chapter on what an SNP leadership election under those conditions looks like. The Starmer wealth tax debate reigniting simultaneously means London's attention will not be on Edinburgh.

If you hold agricultural commodity positions or follow crop insurance markets, check the Indiana and Ohio flood duration warnings. A June 1 end-date for flooding in the heart of the corn belt, during the final weeks of planting season, is not a headline — it is a supply-side signal.

The day's through-line is managed ambiguity: Trump says "no rush," Iran says "many issues resolved," and the gap between those two statements is where the actual negotiation is happening.

The deal isn't done, but the silence from Jerusalem is louder than anything said in Washington today.

— *The Plumb Line*. Daily world brief.

Sources

Iran / Hormuz / Diplomacy

  • newswire/bloomberg — "US, Iran Edge Closer to Deal But Still Need to Negotiate Points," May 25
  • newswire/nyt — "U.S.-Iran Peace Deal Nearer, But Could Take Days to Nail Down," May 25
  • newswire/ft — "Iran says 'many issues' resolved but warns peace deal with US not imminent," May 25
  • newswire/ft — "Rubio says Washington will find 'another way' if Iran talks fail," May 25
  • newswire/bloomberg — "Iran War: Trump Says 'No Rush' as US, Iran Inch Towards Deal," May 25
  • newswire/bloomberg — "Iran's Supreme Leader Faces Toughest Test Yet," May 25
  • newswire/ft — "FirstFT: Trump strikes more cautious tone on peace talks with Iran," May 25
  • newswire/bloomberg — "Xi Thanks Pakistan's Sharif for Mediating in Iran Conflict," May 25
  • gdelt/thelinkpaper.ca — "Strait of Hormuz, sanctions, nukes: Why the US-Iran peace deal is stuck," May 25
  • gdelt/sana.sy — "Oil prices fall amid optimism over U.S.-Iran talks on Hormuz tensions," May 25
  • gdelt/economictimes.indiatimes.com — "European shares climb to over two-month highs on Iran-US peace optimism," May 25

Pope Leo / AI Encyclical

  • newswire/nyt — "Pope Leo Warns of Risks From A.I. in 42,300-Word Encyclical," May 25
  • newswire/bloomberg — "Pope Says AI Should Be Disarmed to Avoid Dominating Humanity," May 25
  • newswire/ft — "Pope Leo warns AI revolution driven by 'idolatry of profit'," May 25
  • gdelt/news.az — "Pope Leo calls for global slowdown on AI in first manifesto," May 25

Space / Orbital

SNP / UK Politics

  • newswire/ft — "Peter Murrell pleads guilty to embezzling £400,000 from SNP," May 25
  • newswire/bloomberg — "Starmer Leadership Strife Reignites UK Wealth Tax Debate," May 25

Israel / Regional

U.S. Flooding

  • noaa_alerts — Flood Warnings: Gibson/Knox/Lawrence/Martin counties IN through May 29–June 1; Holmes/Wayne OH; Forsyth GA; Lower/Upper Yukon AK; Louisiana flood watch, May 24–25

Global Economy / PMI

  • gdelt/myanmarnews.net — "Global business growth grinds to a halt in May amid West Asia conflict; Europe hit hardest: S&P Global Flash PMI," May 25