most of the allegations have been proven to be true, the ones that haven't been proven they just refuse to comment on.
The only "proof" is his statements.
he possibly performed one of the bravest acts of all given the US's track record with assassinations.
If he's so brave, then he and his friends can face the Mt. Everest of evidence against him on US soil, in a US court.
The bravest people will be the ones bringing him in.
Besides, Russia's economic position may make it that much easier for the US to walk in and fly out with him. He can only pump out so much to earn his keep before he's worth more in US hands.