FILE PHOTO: Alexander Vinnik, a 38 year old Russian man suspected of running a money laundering operation using bitcoin, is escorted by police officers to a court in Athens, Greece December 13, 2017. REUTERS/Costas Baltas/File Photo
FILE PHOTO: Alexander Vinnik, a 38 year old Russian man suspected of running a money laundering operation using bitcoin, is escorted by police officers to a court in Athens, Greece December 13, 2017. REUTERS/Costas Baltas/File Photo