TEHRAN threatened all ports in the Gulf today in retaliation for the US military blockade on Iran’s ports as negotiation talks failed.

Marathon talks in Pakistan, aimed at permanently ending the war that began in February with US and Israeli strikes on Iran, did not reach an agreement over the weekend.

There has been no word on whether negotiations will resume.

The US’s restrictions, which include “the entirety of the Iranian coastline, including ports and energy infrastructure,” were expected to begin today.

It was not immediately clear if they had kicked off.

The US military’s Central Command announced that the blockade would be enforced “against vessels of all nations entering or departing Iranian ports and coastal areas.”

It said that it would include all of Iran’s ports on the Persian Gulf and the Gulf of Oman.

Iran’s effective closure of the Strait of Hormuz, through which 20 per cent of traded oil passes normally, has sent oil prices skyrocketing, leaving world leaders panicking and ordinary people facing soaring costs.

In a social media message posted shortly after the blockade was due to begin, US President Donald Trump said Iran’s navy was “laying at the bottom of the sea, completely obliterated,” but he said that Tehran still has “fast attack ships,” and warned that “if any of these ships come anywhere close to our blockade, they will be immediately eliminated.”

Iran issued threats of its own, broadcasting today: “Security in the Persian Gulf and the Sea of Oman is either for everyone or for no-one.

“No port in the region will be safe.”

Israeli Prime Minister Benjamin Netanyahu, who has come under domestic criticism for the inconclusive outcome of the country’s aggressions across the region, expressed support today for Mr Trump’s “strong stance to impose a naval blockade on Iran.”

But in Spain, where Prime Minister Pedro Sanchez has been Europe’s loudest critic of US and Israeli military attacks in the Middle East, Defence Minister Margarita Robles slammed the blockade.

“Since the war began, everything has been senseless,” Ms Robles told Spanish broadcaster TVE.

She said the threatened blockade “is just another episode of the downward spiral we have been dragged into.”