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Vice President JD Vance walked into the cameras on May 29, 2026, with an answer the world was waiting for and delivered something more honest than reassuring. Asked whether President Trump would sign the memorandum of understanding that US and Iranian negotiators had tentatively agreed upon, Vance was direct: “Still TBD.”
Three words. They summarized everything about where the US-Iran war ceasefire effort stands at this moment close enough to touch, not close enough to count.
The MOU framework has been finalized at the negotiating table. A 60-day ceasefire extension, a Strait of Hormuz reopening, mine clearance within 30 days, Iranian oil sales permitted, and formal nuclear talks launched during the window. The structure is there. What remains absent is Trump’s signature and, as of Thursday, Iran has not formally confirmed its acceptance either.
What Vance Said and What He Didn’t
CBS News live updates captured Vance’s full framing: negotiators are “going back and forth” on outstanding language, they have “made a lot of progress,” and the US and Iran are “very close.” But Vance was careful not to promise what he cannot deliver. Trump has been given, according to sources cited by Axios, “a couple of days to think about it.” That timeline, already elastic, extended into Thursday without resolution.
PBS NewsHour reported that Vance’s backing of the deal’s direction does not constitute Trump’s backing a distinction that matters enormously in an administration where the President has historically reversed positions that subordinates have previewed publicly. Vance is signaling progress. Trump has not signaled anything definitive.
What Trump has said publicly is that the deal is “largely negotiated” and will be “announced soon” language he first used on May 23. Six days later, the announcement has not come. He also stated he is “not satisfied” with all terms and is “not in a rush,” two qualifications that leave significant interpretive room.
Strikes and Talks Simultaneously
The backdrop to these diplomatic maneuvers is not a quiet ceasefire. It is an active military conflict running in parallel with the negotiations. NBC News reported that US and Iranian forces traded strikes overnight, with American forces in Kuwait suspected as targets of Iranian missile strikes and the US retaliating with strikes on a base in Bandar Abbas, the Iranian port city adjacent to the Strait of Hormuz.
Both sides have accused the other of ceasefire violations. CNN’s analysis noted that the Trump administration has responded to Iranian ceasefire breaches with notable restraint a deliberate posture designed to preserve the diplomatic track even as military exchanges continue. The political logic is clear: acknowledging Iranian violations too loudly creates domestic pressure to escalate rather than negotiate. The administration is choosing to absorb the provocation in order to keep the MOU on the table.
That calculation has a shelf life. Republican hawks in Congress, already warning that Trump risks handing Tehran a strategic win, are watching each overnight exchange of fire and adding it to their case against the deal.
The Nuclear Problem Has Not Gone Away
The unresolved language points Vance referenced are not formatting disputes. Al Jazeera’s live blog reported that Tehran and Washington have yet to publicly comment on the 60-day truce extension plan a silence on both sides that reflects ongoing sensitivity around the nuclear commitments embedded in the text.
Trump’s core demand that Iran hand over its highly enriched uranium stockpile and permanently surrender nuclear weapons capability remains incompletely resolved. The MOU as structured launches nuclear negotiations during the 60-day window rather than resolving them as a precondition. For Trump, the political challenge is clear: he needs to be able to claim the deal is stronger than the 2015 Obama-era JCPOA. Any language that defers the nuclear question rather than resolving it gives critics a direct line of attack.
Benzinga reported that oil futures fell on Vance’s comments markets interpreting “very close” as directionally positive even as “still TBD” preserved caution. Brent crude, which has held near $99 a barrel through the crisis, dipped modestly on renewed deal optimism before stabilizing. The financial world is pricing in a deal. It is not yet pricing in the specific terms.
What Happens if Trump Doesn’t Sign
The consequences of a Trump refusal to sign are not hypothetical. If the MOU collapses at the presidential approval stage after negotiators on both sides have announced tentative agreement the diplomatic fallout would be severe. Iran would face domestic pressure to escalate. The ceasefire, already porous, would likely break down entirely. Oil markets would spike. The Royal Navy’s mine-hunting vessels, positioned and waiting, would have nowhere to go.
Bloomberg noted that even with a tentative deal on the table, both sides are still accusing each other of truce violations a reminder that the distance between a signed MOU and a genuine ceasefire is itself uncertain.
Trump has “all options on the table,” according to senior officials economic and military if Iran fails to deliver on nuclear commitments during the 60-day window. Whether that leverage framing is enough to satisfy him that this deal is worth signing remains the only question that matters right now.
The truce extension talks continue. The signature waits.
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