STOCKHOLM (AP) — Norway's Supreme Court has rejected Edward Snowden's request for a legal guarantee that would allow him to collect an award in the Scandinavian country without risk of being extradited to the United States.

In its ruling Friday, the Supreme Court upheld decisions by lower courts that also refused the request.

An Oslo law firm filed the lawsuit in April on behalf of the former National Security Agency contractor and the Norwegian chapter of the free speech and literary organization PEN, which had invited Snowden to receive its Ossietzky Prize.

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