Prague - A Prague appeals court on Friday upheld a lower court ruling that a Russian man who faces charges of hacking computers at American companies can be extradited to the United States.Czech authorities arrested Yevgeniy Nikulin in Prague in cooperation with the FBI in October last year. He is accused by US prosecutors of penetrating computers at Silicon Valley firms including LinkedIn and Dropbox in 2012.Moscow also wants him extradited on a separate charge of internet theft in 2009.Prague's Municipal Court ruled in May that both extradition requests meet the necessary legal conditions.Legal opinionNikulin appealed his extradition to both countries but later withdrew an appeal against his extradition to Russia.Following the ruling by Prague's High Court, it is now up to the justice minister to approve or dismiss the extradition. Nikulin's defence attorney said he was "surprised, astonished and disappointed."I don't share the legal opinion of the High Court and I will take the steps I can to reverse it," Martin Sadilek said.Nikulin denied he was a hacker and claimed he's a car lover. He ran a popular Instagram account devoted to sports cars and socialised with the children of the Kremlin's elite, including the daughter of Russian Defence Minister Sergei Shoigu.