The Czech Republic's top court said Tuesday it has delayed the extradition of an alleged Russian hacker until it deals with a last-ditch complaint filed by him.

It means that the justice minister can't finalize Yevgeniy Nikulin's extradition until the Constitutional Court rules on the matter.

Nikulin has exhausted all appeals, but his lawyers presented a final complaint to the court in a bid to postpone his extradition to either the U.S. or Russia. The contents of the complaint weren't made public, but Nikulin's defense has previously said that appeals court judges were biased.

Czech authorities arrested Nikulin in Prague in cooperation with the FBI in October 2016. He is accused by U.S. prosecutors of hacking computers at Silicon Valley firms including LinkedIn and Dropbox in 2012 and the U.S. wanted him extradited to face a trial there.

Moscow also wants him extradited on a separate charge of internet theft in 2009.

Both countries submitted their extradition requests on the same date.

Nikulin denies he's a hacker. His defense attorney claimed his case was politically motivated in the U.S.

Czech courts ruled that both extradition requests meet the necessary legal conditions, leaving the final decision to Justice Minister Robert Pelikan.