Jeremy Hunt launches fresh diplomatic bid to prevent Iran nuclear deal unravelling and ease tensions in the Gulf

Jeremy Hunt is to launch a fresh diplomatic bid to prevent the Iran nuclear deal unravelling and to ease tensions in the Gulf.

The foreign secretary will travel to Brussels on Monday for a meeting of EU foreign ministers to seek support from the European signatories to the agreement - France and Germany.

Ahead of the meeting, Tory leadership candidate Mr Hunt said: "The Middle East is already one of the most unstable regions in the world, but if the different parties were armed with nuclear weapons it would represent an existential threat to mankind. I will do everything in my power to prevent that from happening.

"I'll be building on the leadership shown by the UK, alongside France and Germany, as we do what it takes to maintain the nuclear deal, and to work to encourage Iran back into compliance."

His visit comes after he offered to help secure the release of the Iranian supertanker Grace 1 held in Gibraltar after being detained in an operation involving British Royal Marines.

In a telephone call with Iranian foreign minister Mohammad Javad Zarif on Saturday, Mr Hunt sought to reassure him the vessel was intercepted over suspicions it was carrying oil to Syria - and not because it was Iranian.

He said he had offered to facilitate the tanker's release in return for guarantees from Tehran that it would not breach EU sanctions on the Assad regime.

The move comes amid heightened tensions in the Gulf following Donald Trump's decision to unilaterally withdraw the US from the nuclear deal.

Last week, a Royal Navy warship intervened to drive off Iranian patrol boats after they approached a British tanker as it sailed through the Strait of Hormuz.

It prompted fears the Iranians were trying to seize a UK ship in retaliation for the detention of the Grace 1.

It was the latest in a series of incidents in the region prompting fears of a slide into all-out conflict.

Ahead of Monday's meeting, Mr Hunt also stressed the importance of maintaining freedom of navigation in the Gulf.

He said: "Following the brave work of our Royal Navy in the Persian Gulf we will work with partners to maintain the right of commercial ships to go about their rightful business."

Additional reporting by Press Association.