ATHENS (AP) — Russian cybercrime suspect Alexander Vinnik, who is wanted in the United States on charges of laundering billions of dollars’ worth of the virtual currency bitcoin, appeared Wednesday before Greece’s Supreme Court for a hearing into his extradition to the U.S.

Vinnik is the subject of a judicial tug-of-war between the U.S. and Russia, which is also seeking his extradition on lesser charges.

Court officials said a decision on the U.S. request would be announced on Dec. 13. If it decides in favor of extradition to the U.S., Greece’s justice minister will have the final word on where the suspect will be sent. Lower courts in Greece have approved both extradition requests.

Vinnik is fighting his extradition to the United States, but not to Russia.

The U.S. is accusing Vinnik of laundering $4 billion worth of bitcoins through BTC-e, one of the world’s largest digital currency exchanges, which he allegedly operated.

Russia, meanwhile, wants him back to face charges related to a 667,000-ruble ($11,500) fraud.

On Wednesday, Vinnik repeated arguments made earlier, maintaining that he was the operator and not owner of the trading platforms.

The court heard testimony from two Russian businessmen and an expert who formerly headed the Greek Police’s cybercrime division.

Vinnik’s lawyers described the arguments made in the U.S. request as vague and failing to fully comply with procedure.

“We presented our legal arguments, which in our view should lead the Supreme Court to reject the extradition request,” lawyer Alexandros Lykourezos, heading Vinnik’s defense team, told the AP.

The 37-year-old was arrested on a U.S. request in July while on holiday with his family in the Halkidiki area of northern Greece, which is popular with Russian tourists.

The U.S. Justice Department says Vinnik has been indicted by a grand jury in the Northern District of California on charges including money laundering, conspiracy to commit money laundering, and engaging in unlawful monetary transactions. The charges carry maximum sentences of up to 20 years in prison.

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FANIS KARABATSAKIS, Associated Press

Elena Becatoros in Athens contributed to this report.