Mr Gershkovic has become the first Western journalist to be arrested and imprisoned on espionage charges in Russia since the Cold War.
The court also fined Google on Wednesday for sharing lesbian, gay, bisexual, and transgender propaganda, which has been banned in Russia.
The fines now total 8.4 million rubles.
Aleksei Navalny is an advocate for reforms against corruption in Russia, and a critic of president Vladimir Putin and his government.
“If the prison term is the price of my human right to say things that need to be said … then they can ask for 113 years.”
