Did they talk for 21 hours straight? The US-Iran negotiations break down, tensions escalate immediately

This "marathon-style" US-Iran negotiation lasted from Saturday into early Sunday morning, a full 21 hours, five rounds of bargaining, back-and-forth documents—yet no consensus was reached.

The US side's attitude was very firm:
J.D. Vance held a brief 4-minute press conference and then left, directly pointing out that Iran is unwilling to clearly abandon its nuclear weapons program, citing "too many differences." At the same time, the US has already提出 the so-called "final plan," passing the ball back to Tehran.

Iran responded directly:
Tehran criticized the US for提出 "excessive and unrealistic" demands, and admitted that there are indeed two or three core issues stuck, but also emphasized: "Thinking one negotiation can solve everything? That's naive."

Even more crucial is this harsh statement:
Iran said it is "not in a hurry to restart negotiations," and implied—unless the US makes concessions, the situation in the Strait of Hormuz will be difficult to calm. This vital global energy transportation route, if disrupted, would impact not just the Middle East but the entire world oil market.

Public opinion warfare also began simultaneously:
Iranian media accused the West of deliberately exaggerating the "improved atmosphere" of negotiations, portraying normal negotiations as "intense conflicts" or "breakthrough interactions," essentially to influence market sentiment and even manipulate oil prices.

As for the next round?
Time and location are still undecided. Although Pakistan is still trying to mediate, Iran's attitude has clearly cooled.

One sentence summary:
The negotiations have broken down, risks are rising, and what the market should really watch is not the outcome, but the upcoming changes.