One of the Arab world's top spies and a shadowy conduit to Vladimir Putin's Kremlin were present at a meeting in the Seychelles being probed by Robert Mueller's Russia investigation, DailyMail.com can disclose.

The meeting between Erik Prince, the Trump donor and billionaire Blackwater founder whose sister is education secretary Betsy DeVos, and Kirill Dmitriev, a Russian banker close to the Kremlin, was convened by the crown prince of Abu Dhabi, Mohamed bin Zayed, who is the de factor joint ruler of the United Arab Emirates.

But DailyMail.com can disclose that also present were bin Zayed's spy chief and a Palestinian seen as the crown prince's personal conduit to Putin's Kremlin.

The two men - Hamad al Mazroie, the de facto head of the UAE intelligence service, and Mohammed Dahlan, a bin Zayed adviser who is fluent in Russian - were never named by Prince when he testified to the House intelligence committee about the meeting.

It emerged last month that George Nader, a Lebanese-American businessman and Middle East expert with ties to the Trump administration was present.

Strange meeting: Billionaire Blackwater founder Erik Prince (left) - whose sister is Education Secretary Betsy DeVos - has testified that he met a Russian oligarch in the Seychelles. Now DailyMail.com discloses that he did not tell Congress that also present were the United Arab Emirates' top spy Hamad al Mazroie (right)

Details: Erik Prince has already said that he went to the Seychelles to meet Mohamed bin Zayed, the crown prince of Abu Dhabi, then had an encounter with Kirill Dmitriev, an oligarch close to Vladimir Putin

New details: DailyMail.com can reveal that also present was Mohammed Dahlan (left), a bin Zayed adviser who is fluent in Russian who is known as the UAE's conduit to Putin. And it can also be revealed that George Nader, who is co-operating with the Robert Mueller probe, was involved in a massive arms deal between Russia and Iraq

Venue: Despite Erik Prince having a home in the UAE, he was invited to meet the crown prince of Abu Dhabi at the Four Seasons in the Seychelles. The Abu Dhabi crown prince is seen as the de facto joint ruler of the United Arab Emirates

Nader is now co-operating with Mueller after being stopped as he entered the U.S. in January and being served with a subpoena.

The identities of the two newly-named attendees at the meeting were confirmed to DailyMail.com by a source close to bin Zayed, and a Kuwaiti lawmaker with access to intelligence on the UAE.

The source close to bin Zayed said: 'Hamad supervises all these things. Those guys supervise major secret operations.'

Their presence adds a new dimension to the now notorious meeting in the Seychelles.

The meeting, which took place in January 2017, was disclosed in April last year in a Washington Post report.

It was said to be an attempt by the UAE to create a back channel of communication between the incoming Trump administration and the Kremlin.

Prince donated $250,000 to the Trump campaign and was known to be close to Steve Bannon, who become Trump's senior adviser in the White House.

Prince testified that he first met the crown prince - known by his initials MBZ - at the Four Seasons resort on the tropical islands, and was then introduced to Dmitriev, a Russian oligarch and friend of Putin.

The Blackwater founder told the House Intelligence Committee under oath that the prince had invited him to discuss 'business opportunities' and that 'some of his brothers' were present as well as an 'entourage'.

The prince is one of 19 sons born through his late father's seven marriages.

Prince told the intelligence committee that he met with Dmitriev only because the Emiratis said that they should and that the two discussed US-Russia relations, including trade but did not even exchange business cards after the discussion over a beer.

Prince has denied representing the Trump transition during the meeting, which he characterized as a chance encounter in the hotel bar over a beer that lasted no more than 30 minutes.

However Prince never mentioned the presence of al Mazroie or Dahlan.

According to sources close to the UAE leadership, al Mazroie acts as bin Zayed's right hand man and informal head of intelligence, giving him access to the country's advanced surveillance technology.

The sources say he is at the center of an Emirati plan to exert influence on both western democracies and its neighboring Gulf states.

Focus: George Nader has co-operated with special counsel Robert Mueller's investigation

Spy: Hamad al Mazroie, the de facto head of the UAE intelligence service - see outside London department store Harrods - can be revealed to have been at Erik Prince's meeting with a Russian oligarch in the Seychelles

Leaked text messages have claimed to show the spymaster threatening to release naked photos of Kuwaiti politicians in an attempt to influence the country's parliamentary elections.

Abdullah al Saleh, a Kuwaiti activist in London who is opposed to the Saudi regime, tweeted a copy of the texts, claiming: 'Hamad al Mazroie leaked this picture to social media outlets to blackmail and influence the Kuwaiti elections.'

A Qatari news anchor for state broadcaster al Jazeera also launched a lawsuit against al Mazroie claiming that the spymaster threatened to release fabricated sex tapes of the anchor.

On Twitter, anchor Jamal Rayyan wrote: 'I am amazed how Sheikh Mohammed bin Zayed al-Nahyan, the Crown Prince of Abu Dhabi, and Sheiks of the #UAE would accept such acts done by Hamad al Mazroie and his partners. They used Emirati cell phones and sent photoshoped/fake sexual photos along with video and audio insults to my WhatsApp.'

Dahlan is a former leader of the Fatah party in the Gaza Strip and was exiled in 2011 and fled to the UAE amid allegations he may have murdered Yasser Arafat.

There he became a security adviser to bin Zayed, according to the Emirati source, and began working as an informal UAE emissary to the Kremlin, helping coordinate the UAE's military action to cooperate with Russian interests.

'We’re entering Dahlan's ninth year there now. He became closer and closer to MBZ and more powerful in the UAE.

'His assignments changed from just giving advice to going on secret missions, meeting at the Kremlin on behalf of MBZ,' said the source.

The source added that Dahlan worked closely with both Prince and Nader.

The sources claimed that the Seychelles meeting, which is being investigated by special counsel Robert Mueller as part of his probe into Russian meddling in the US election, is the tip of the iceberg.

Family: Erik Prince is the brother of Betsy DeVos, Trump's education secretary

The source close to bin Zayed claims that 'Dahlan met with Erik Prince and the Russians several times' in the Maldives - a second island archipelago.

Prince has never disclosed further meetings and told the House intel committee that he had not met Russians in any form after the Seychelles encounter.

He also never told members of Congress that Nader was present.

A spokesman for Prince declined to comment. DailyMail.com has reached out to the UAE's embassy in Washington for comment but has yet to receive any.

DailyMail.com can disclose that Nader is not just a Lebanese-American businessman but has played a part in brokering a multi-billion dollar arms deal with Russia.

Former Iraqi officials told Arab news site Al-Monitor that Nader helped broker a controversial $4.2bn arms deal between Russia and Iraq in 2012.

One official told the site that Nader travelled to Moscow and met with Russian officials, saying he represented Iraqi Prime Minister Nouri al-Maliki.

Another who was involved in the deal said he saw Nader discuss the deal with Maliki in a Moscow hotel at the time.

Nader is cooperating with special counsel Robert Mueller for his investigation into the Trump campaign, according to the New York Times.

Nader gave testimony to a grand jury convened in Mueller's investigation of the Trump campaign last week, two sources told The Times last Tuesday.

DailyMail.com understands Nader spoke to the Trump administration on Middle East strategy, while being paid by the UAE as an adviser to its leadership.

He is a well-connected expert on the Middle East who is rumored to have links with intelligence agencies.

White House sources say that Nader became a friend of former chief Trump strategist Steve Bannon while he was still working for the president.

It is understood that Nader met several times with Bannon and at least once with Trump's son-in-law Jared Kushner.

A source close to MBZ said of Nader: 'The world doesn't hear a lot about George Nader, but he is a key player.

'This guy flies under the radar but he has the strongest ties with Trump and his team.

'He worked with Kushner and Steve Bannon, they are friends.

'But Nader goes to Abu Dhabi more than he goes to his [own] house. MBZ [Mohammed bin Zayed] runs his show. And he sends him on secret missions.

Friends: George Nader represented himself as a friend of both Steve Bannon and Jared Kushner

'He went to Abu Dhabi last month. He goes to Abu Dhabi a lot.

Nader's testimony to Mueller was reported by the Wall Street Journal to have contradicted Prince's evidence to the House intel committee.

In particular, the Journal reported, Nader had said that the Emiratis did not introduce Prince and Dmitriev, and that they were under the impression that Prince was attending as a surrogate for the Trump transition - while the Russian was representing Putin.

The Washington Post reported last week that Mueller had gathered evidence that the meeting was an attempt to establish a back channel between the Kremlin and the Trump transition.

Nader's role in both the meeting and the wider Trump administration has come under growing scrutiny.

Earlier this month emails leaked to the New York Times showed Nader was fed a detailed memo of a private meeting in the Oval Office by a top Trump donor.

Elliott Broidy, who was a major financial backer to the president's electoral campaign, sent Nader the memo after meeting Trump in the White House, according to the report.

Broidy, whose private security company Circinus has contracts with the UAE worth hundreds of millions of dollars, lobbied Trump to back the UAE's military action in the Gulf during the meeting, according to the memo.

Despite humble beginnings, Nader has been close to leaders across the Gulf region for decades, as well as other US presidents.

He moved from Lebanon to the US with scant English aged just 15 and five years later while studying at Cleveland State University Nader founded a magazine called Middle East Insight in 1980.

Though his magazine was put together in his basement and had a small circulation of a few thousand, Nader had a surprising level of access to leaders in the US and the Middle East, even interviewing Presidents Bill Clinton and George H.W. Bush while they were in office.

Mueller is investigating whether the Trump campaign colluded with Moscow's interference in the 2016 election.

In February the special counsel indicted 13 Russians for operating a campaign of 'information warfare' against the US stretching back to 2014.