And even if they didn't, the experience of these investigations shows America is a big country with many places to hide.

BBC: FBI releases photos of Boston suspects

Prokhorov put on charm offensive when he bought the Nets, but the man has big ambitions and the United States isn't the only country where ambitious rich guys think they'd be awesome presidents.

WSJ: Jason Gay: Water Cooler Topics Are Overflowing

And though 2007's "No Country for Old Men" didn't win the festival's big prize, the buzz surrounding the film after its Cannes showing was instrumental in carrying it to a best picture win at the Oscars.

CNN: Cannes exposure is no guarantee of success

"I don't see though why it has to be a big deal - today you live in one country, tomorrow you move to the other and in the future you might come back".

BBC: A tale of two Russians