A Russian court jailed a Norwegian man for 14 years on Tuesday.
Frode Berg, 63, was accused of espionage, gathering information on nuclear submarines.
A retired former guard on the Norwegian-Russian border he was detained in Moscow in Dec. 2017.
Berg admitted having been caught with sensitive material but pleaded not guilty to charges of espionage on behalf of Norway.
Berg will request a presidential pardon from Vladimir Putin, said his lawyer Ilya Novikov.
Norway’s Foreign Ministry said it was working to bring Berg back to Norway wish to see his safe return.
Details of the case have not been revealed.
Putin appeared to leave the door open to the possibility that Berg could be pardoned or possibly exchanged as part of a prisoner swap.
Berg’s lawyer Ilya Novikov said, Presidential pardon is not something that is granted in the natural course of events, but with diplomatic measures it is possible.
The verdict could strain relations between Moscow and NATO-member neighbor Norway.