Hunter Biden flew to Moscow for a meeting with now-sanctioned Russian oligarch ...

Hunter Biden flew to Moscow for a meeting with a now-sanctioned Russian oligarch with reportedly close ties to Vladimir Putin, laptop files reveal.

Vladimir Yevtushenkov, 73, owns a company which reportedly supplied Putin's forces with drones used for deadly bombing raids in Ukraine and until last year owned key Russian defense contractor RTI.

But while he was added to the UK and Australian sanctions lists this month but remains one of a handful of oligarchs unsanctioned by the Biden administration.

Hunter's multiple meetings and apparent business deals with him are the latest in a troubling web of his connections to Putin-linked mega-rich individuals which has emerged from his abandoned laptop.

Emails show the president's son and his business partners were courting Yevtushenkov for an investment in their real estate company in 2012 and 2013.

Rosemont Realty was founded in 2008 by Hunter's Yale schoolmates: Devon Archer and former secretary of state John Kerry's stepson Chris Heinz.

Hunter joined the firm's advisory board in 2010 and was a part owner, earning him hundreds of thousands.

Emails show that in 2011, his now-jailed business partner Archer was traveling to Russia, staying in luxury hotels and dining on bear meat, laying the foundations for future real estate deals that he believed could be lucrative for the firm.

In November that year Archer wrote to an associate: 'Moscow is going great… It does look like I will be back quite a bit based on our initial response to the real estate fund pitch.'

Three months later Hunter got involved, scheduling a trip to the Russian capital for a dinner with Yevtushenkov at the headquarters of his company Sistema on February 16, 2012, according to emails and calendar entries on his laptop.

Documents published this week by journalist Vicky Ward on her blog suggest the Russian billionaire then took a trip to the US for meetings with Hunter and his Rosemont Realty business partners.

A Sistema itinerary translated from Russian, which Ward reported was leaked to her from a source close to Yevtushenkov's company, lists a March 14, 2012 'breakfast with Hunter Biden' at the Ritz-Carlton in New York. 

Later that day Yevtushenkov flew to Dallas, Texas and had another 'breakfast with Rosemont Realty' at the city's Ritz-Carlton on March 15, according to the itinerary.

Eight months later, Archer wrote an email outlining two January 2013 meetings with Hunter and the oligarch in Washington DC, part of an apparent pitch of a commercial real estate deal for Rosemont Realty.

'I am meeting with Evtushenkov for dinner Sunday evening January 27th in DC at Cafe Milano and then meeting in my DC offices Monday the 28th at 10am,' Archer wrote, using the alternative spelling for the oligarch's name.

'We are going to be reviewing our commercial office investment program with him and his team. From there we are going to see one of our properties in the afternoon called Dulles View, a $110mm office property in the DC sub market, as an example of our portfolio holdings.

'Joining me will be one of my Partners in Rosemont Seneca and an Advisory Board Member of Rosemont Realty, Hunter Biden.'

Archer's email was to Kazakhstan banker Marc Holtzman, a key fixer for Archer and Hunter.

Holtzman replied: 'Vladimir mentioned this. I raved about you and will see him next week in Davos so will reemphasize this.'

Archer forwarded the reply to Hunter, noting Holtzman's close relationship to Yevtushenkov.

'FYI...Marc Holtzman was on the [IT company] PGRX Board with me before I left in December. He's also the Head of the Finance Committee on Evtushenkov's, Sistema Board of Directors, which benefits us,' Archer wrote to Hunter.