President Donald Trump said Sunday the United States was conducting "very positive discussions" with Iran, as he outlined a plan for US forces to escort ships through the blocked Strait of Hormuz beginning Monday.

He said the new maritime operation, which he dubbed "Project Freedom," was a "humanitarian" gesture for crews aboard the many ships swept up in the blockade and which may be running low on food and other crucial supplies.

"We will use best efforts to get their Ships and Crews safely out of the Strait. In all cases, they said they will not be returning until the area becomes safe for navigation," Trump said in a lengthy post on his Truth Social platform.

Iran has maintained a stranglehold on the strategic Strait of Hormuz since the US and Israel launches strikes on Iran on February 28. In retaliation, Tehran has hit targets in Israel and Gulf nations.

The statement made no mention of what Tehran described as a 14-point plan "focused on ending the war," and which Iran's foreign minister said Washington had already responded to it in a message to Pakistani mediators.

"We are reviewing this and will take whatever response is necessary regarding it," spokesman Esmaeil Baqaei told state television.

Negotiations between the two countries have been deadlocked since a ceasefire came into effect on April 8, with only one round of direct peace talks held so far.

"I am fully aware that my Representatives are having very positive discussions with the Country of Iran, and that these discussions could lead to something very positive for all," Trump said.

By blocking the Strait of Hormuz, Iran has choked off major flows of oil, gas and fertilizer to the world economy, while the United States has imposed a counter-blockade on Iranian ports.

As of April 29, more than 900 commercial vessels were located in the Gulf, according to maritime intelligence firm AXSMarine.

"The Ship movement is merely meant to free up people, companies, and Countries that have done absolutely nothing wrong -- They are victims of circumstance."

- 'Impossible operation' -

US news website Axios, citing two sources briefed on the proposal, reported that Iran set "a one-month deadline for negotiations on a deal to reopen the strait," dissolve the US naval blockade and end the war.

Earlier Sunday, the Revolutionary Guards sought to put the onus back on Trump, saying he must choose between "an impossible operation or a bad deal with the Islamic Republic of Iran."

Washington's European allies are concerned that the longer the strait remains closed, the more their economies will suffer, and German Foreign Minister Johann Wadephul demanded that it be reopened.

In a call with his Iranian counterpart Abbas Araghchi, Wadephul stressed that Germany supported a negotiated solution but that "Iran must completely and verifiably renounce nuclear weapons and immediately open the Strait of Hormuz."

Oil prices are currently about 50 percent above pre-conflict levels, largely due to the supply snarls in the strait.

- 'Suffocating the regime' -

The US president, who spent the weekend at his Mar-a-Lago resort in Florida, on Sunday declined to specify what could trigger new American military action.

But in his post he said that "if in any way, this Humanitarian (ship-guiding) process is interfered with, that interference will, unfortunately, have to be dealt with forcefully."

Treasury Secretary Scott Bessent said the US naval blockade was only part of a broader economic embargo.

"We are suffocating the regime, and they are not able to pay their soldiers. This is a real economic blockade, and it is in all parts of government," he told Fox News.

In yet more bellicose rhetoric, Mohsen Rezaei, a military adviser to Iran's Supreme Leader Ayatollah Mojtaba Khamenei, said Iranian forces would sink US ships.

"The US is the only pirate in the world that possesses aircraft carriers. Our ability to confront pirates is no less than our ability to sink warships. Prepare to face a graveyard of your carriers and forces," he posted on X.