A Russian man identified as Alexander Vinnik, center, is escorted by police officers to the courthouse at the northern Greek city of Thessaloniki on Friday, Sept. 29, 2017. The Russian cybercrime suspect Alexander Vinnik, is wanted in the United States in a $4 billion bitcoin fraud case as Russia wants to extradite him as well on separate fraud charges. (AP Photo/Giannis Papanikos)
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