DUBAI, June 1 (Reuters) - Iran's Tasnim news agency said on Monday that Tehran's negotiating team is stopping exchanges of messages with the United States through mediators due to attacks on Lebanon, as diplomatic efforts to end the three-month-old Iran war continue.

The agency said Iran and the Resistance Front, which includes its Shiite allies in Yemen, Lebanon and Iraq, have set an agenda to completely block the Strait of Hormuz and activate other fronts, including the Bab El Mandeb Strait, in order to "punish" Israel and its supporters.

By Jonathan Saul and Renee Maltezou

ATHENS, June 1 (Reuters) - Shipping executives meeting in Athens on Monday said that any peace deal worked out between the United States and Iran would need to offer clear rules allowing vessels to resume normal business via the Strait of Hormuz.

Shipowners and maritime industry officials met at a Capital Link conference and other events to begin Posidonia, a week-long biennial shipping exhibition.

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LONDON, June 1 (Reuters) - Britain has blocked Cenk Uygur, a left-wing Turkish-American media personality, and his nephew, Hasan Piker, a U.S. left-wing commentator and influencer, from entering the country to speak at events, both said on Monday.

Uygur, who co-hosts the popular YouTube channel "The Young Turks", and Piker said they had been barred because of their views on Israel.

Israel and Hezbollah clashed overnight despite US President Donald Trump's announcement that both sides had agreed to halt fighting ahead of US-hosted talks between Israel and Lebanon on Tuesday.

Israel's growing offensive in Lebanon, including heavy bombardment and its deepest ground invasion in two decades, has threatened to scupper a ceasefire in the wider Middle East war between the United States and Iran.

DUBAI, June 1 (Reuters) - Iran on Monday blamed the slow pace of efforts to end the U.S.-Iran conflict on a lack of trust, contradictory positions from Washington and continued Israeli attacks in the region.

"Negotiations have started amid severe suspicion and mistrust, and the exchange of messages is taking place in this atmosphere," foreign ministry spokesperson Esmaeil Baghaei said, adding that the two countries had not yet reached a final conclusion.

France said on Monday it had detained a Russia-linked oil tanker in the Atlantic, with the Kremlin comparing the latest seizure aimed at tackling Moscow's sanctions-busting shadow fleet to "international piracy".

Since September, France has boarded three other ships believed to belong to the shadow fleet, used by Russia to circumvent Western sanctions on its fossil fuel exports imposed over the Kremlin's 2022 invasion of Ukraine.

JEURSALEM, June 1 (Reuters) - Israeli Prime Minister Benjamin Netanyahu in a statement on Monday ordered the military to attack targets in the Lebanese capital Beirut's southern suburbs, a Hezbollah stronghold known as Dahiyeh.

(Reporting by Rami Ayyub; Editing by Sharon Singleton)

June 1 (Reuters) - President Donald Trump on Monday said that Iran really wanted to make a deal with the U.S. and that it would be a good one for Washington and its allies.

His post comes only hours after the U.S. military said it struck Iranian military sites at the weekend and Iran's Revolutionary Guards said they had targeted a U.S. base in response, the latest in a series of exchanges amid negotiations to end the three-month-old war.

By Yomna Ehab

DUBAI, June 1 (Reuters) - The U.S. said it struck Iranian military sites at the weekend and Iran's Revolutionary Guards said on Monday it had targeted a U.S. base in response, the latest in a series of exchangesamid negotiations to end the three-month-old war.

The strikes on Iran's Gulf coast were in response to "aggressive Iranian actions that included the shootdown of a U.S. MQ-1 drone that was operating over international waters," the U.S. Central Command said in a post on X.

Oil prices jumped and equities were mixed Monday as Middle East peace talks stumbled, while Lebanese authorities said Hezbollah had accepted a US proposal for a "mutual cessation of attacks."

Crude futures shot around seven percent higher after an Iranian state news agency announced Tehran had suspended its negotiations with Washington via mediators.

International benchmark Brent closed 4.2 percent higher while its US counterpart, the West Texas Intermediate, added 5.5 percent.