The guy goes on holiday from Russia to Greece and then after being arrested and extradition sought to the USA he's suddenly also wanted back in Russia on a minor charge.
As someone who was born in Soviet Union, I am not surprised at all. A former world super-power will do whatever in can to prevent its citizen from getting into the hands of USA authorities. Especially, if the citizen in question has been working for Russian mafia, which has been known to have close ties to country's government officials. It's very likely he would be released soon after reaching Russia and then killed by something staged as a suicide, because the risk of him opening his mouth is too high.
Yes the Russians do it, but I remember the US doing the same thing multiple times. I guess no country wants their citizens to be tried elsewhere.
My first thought was, "isn't there someone in Greece who lost bitcoin in Mt. Gox? They could just prosecute them in Greece".
Who wants to be extradited to the US ? Nobodoby, especially russians !