The Moscow court said Shtein, who served as a Moscow municipal deputy until 2022, would begin her sentence once she could be extradited to Russia.
Islamic State has claimed responsibility for the massacre and US officials say they have intelligence showing it was carried out by the network's Afghan branch, Islamic State Khorasan.
Gershkovich, his paper, and the US government all strongly deny the charges against him, which carry a sentence of up to 20 years in jail.
The terror attack, which is the worst Russia has seen in years, has led to the authority's torture of the terrorists prior to their court hearings, as Russia seeks to lay blame on Ukraine.
Vladimir Kara-Murza, who suffers from a neurological condition after surviving two attempts to poison him, was transferred to a new Siberian penal colony in January.
Russia on Monday cast doubt on assertions by the United States that the Islamic State militant group was responsible for a gun attack on a concert hall outside Moscow that killed 137 people.
Russian Chief Rabbi Berel Lazar calls for subdued Purim celebrations following ISIS terrorist attack in Moscow.
Putin vowed to punish those behind concert massacre.
The Russian president could be placed under arrest if he enters any ICC states.
The Iranian leader expressed “hope that his [Putin’s] new term would provide a suitable ground for the promotion of relations between Tehran and Moscow.”