The fourth round of Iran-US negotiations on Tehran's nuclear program have been postponed.

Oman's foreign minister facilitated negotiations, he said the talks held in Rome on Saturday are being rescheduled due to logistical reasons, adding that a new appointment will be set when the parties agree.

This comes after U.S. Defense Secretary Pete Hegseth warned Thursday that Iran would "pay the consequences" to support Yemen's Houthi rebels. Washington also announced sanctions this week on companies linked to Tehran.

President Donald Trump pulled the United States from a nuclear deal between Iran and five other world powers in 2018 and long said he would make a "better" deal.

Trump had previously warned that if these new negotiations began in April, they would not be successful. Both sides described the first round of negotiations in Muscat, the capital of Oman, as “constructive.”

The Iranian Foreign Ministry confirmed that the latest talks have been postponed, but Washington has not yet made any official comments.

But an unnamed U.S. source told Reuters that Washington "never confirmed" its participation in the fourth round of negotiations, nor did they confirm their time.

The delay is unlikely to mean that negotiations have collapsed and both sides are eager to avoid war.

However, Tehran's report describes growing doubts about the usefulness of the negotiations, which suggests new sanctions and what Tehran calls a contradictory position.

Trump's "maximum pressure" policy on Tehran announced that the sanctions were announced on Wednesday, with the United States saying the U.S. involves illegal trade in Iran's oil and petrochemicals.

"The Iranian regime continues to intensify conflict in the Middle East, advances its nuclear program and supports its terrorist partners and agents," the U.S. State Department said in a statement.

“Today, the United States is taking action to stop the revenue the regime uses to fund these unstable activities.”

A spokesman for the Iranian Foreign Ministry said the latest sanctions were "a further proof of the ambivalent behavior and lack of sincerity of the US policymakers."

Media reports in Iran also pointed to a post by Hegseth on X earlier Thursday, with Trump's special envoy reposting a post leading the U.S. delegation to Steve Witkoff, the Middle East.

The post reads: "Message to Iran: We see your fatal support for Husie. We know exactly what you are doing. You will pay the consequences at the time and place we choose."

Hushis declared himself to be part of the “axis of resistance” of the Hezbollah movement against Israel, the United States and the wider West – with Hamas and Lebanon.

In recent months, the United States has launched several deadly strikes against Hotti targets in response to the organization's transport to the Red Sea, which began in November 2023 in response to Israel's military campaign in Gaza.

Trump said he is looking for a solution that would close Iran's path to building nuclear bombs. But, in his administration, some are working to completely remove Iran's nuclear enrichment plan.

They are also pushing Iran to stop supporting agents in the region, including Hotis.

Iran said its plans are peaceful and have the right to be fulfilled. It hopes to reach an agreement but will not limit its nuclear program in exchange for sanctions relief.

After Russia, Iran has been subject to the widest sanctions in history - the United States imposed on the country.

President Massoud Pezeshkian centered on his commitment to lifting these sanctions and on Iran's economic policy.