A Moscow court has sentenced Russian-born US citizen Gene Spector to 15 years in prison on espionage charges, adding to his existing imprisonment for bribery, according to Russian state media reports.

Spector, who was already serving a 3.5-year sentence for bribery, received the new sentence on Tuesday. The court ordered him to serve his term in a maximum security penal colony and imposed a fine of approximately 14.1 million rubles ($140,500).

The espionage charges against Spector were filed in August 2023, though specific details of the allegations remain classified due to the secret nature of the case. The trial proceedings, except for the sentencing, were conducted behind closed doors.

Before his initial arrest in 2020, Spector served as chairman of the board of Medpolymerprom Group, a company specializing in cancer treatment drugs. He had previously pleaded guilty to facilitating bribes to Anastasia Alekseyeva, a former aide to ex-Deputy Prime Minister Arkady Dvorkovich. Alekseyeva was later sentenced to 12 years for accepting bribes in the form of luxury vacation trips.

Born in Leningrad (now St. Petersburg) in 1972, Spector later moved to the United States and obtained US citizenship. He becomes the latest in a series of US citizens detained and sentenced in Russia on various charges, following cases like Wall Street Journal reporter Evan Gershkovich and former US Marine Paul Whelan.