A Norwegian appeals court has dismissed a lawsuit seeking a legal guarantee to allow Edward Snowden to travel to Norway without risk of being extradited to the United States.

The Borgating court upheld Wednesday a ruling by a lower district court saying it cannot issue such a guarantee for someone who isn't present in Norway.

An Oslo law firm filed the lawsuit in April on behalf of the former National Security Agency contractor and the Norwegian chapter of PEN that had invited Snowden to receive its Ossietzky Prize in November. The literary group had appealed the Oslo district court June ruling.

Snowden, who is currently in Russia, faces U.S. charges that could land him in prison for up to 30 years for leaking details of a secret U.S. eavesdropping program.