Iran has rebuffed U.S. proposals on reopening the Strait of Hormuz and addressing its nuclear program, Fars news agency reported, citing a source close to the negotiating teams.

The source said Washington had pressed for demands during the talks that it had failed to secure through military action, and claimed the U.S. delegation had been looking for a pretext to exit the process from the very beginning. Tasnim agency, in turn, attributed the collapse of the talks to what it described as excessively tough conditions put forward by the American side.

Negotiations between Iran and the United States, held in Pakistan, lasted about 21 hours but ended without any agreement.

According to Axios, Tehran insisted on maintaining control over the Strait of Hormuz and refused to give up its stockpiles of enriched uranium.

U. S. Vice President Jay D. Vance, who took part in the talks, confirmed that Washington and Tehran failed to reach a deal in Pakistan. He said the U.S. delegation was returning home without an agreement and indicated that the outcome was more negative for Iran, as it chose not to accept American terms.

The impasse now puts a fragile two-week ceasefire at risk, increasing the likelihood of renewed fighting and further escalation.