"The sentence comes into force as of today," the verdict reads.
Koptsev, who was 20 at the time of the attack, charged into a synagogue on January 11 shouting anti-Semitic slurs, and stabbed nine Jews with a kitchen knife before being wrestled to the ground. In his final statement before the court, he apologized to the victims and their families.
"We will probably lodge an appeal with the European Court of Human Rights in Strasbourg," said lawyer Roza Saribzhanova, a member of Koptsev's defense team, adding that she believes the court will take into consideration her client's alleged psychiatric disorder.
The Moscow City Court refused a trial by jury for Koptsev and handed down a 16-year sentence in a maximum-security prison on September 15. The court also ordered that Koptsev undergo compulsory psychiatric treatment in prison.
Koptsev was initially given a 13-year prison sentence in March for attempting to murder nine people, but was cleared of race-hate charges. The decision was disputed by both lawyers and prosecutors.
In their appeals, Koptsev's lawyers said the defendant was mentally unstable, while prosecutors said a 13-year sentence was insufficient, and pressed for 16 years in a maximum-security prison.
The Supreme Court overturned the lower court's decision in June and ordered a retrial after Koptsev's lawyers and the prosecutors appealed against the verdict.
The court also questioned two medical experts who confirmed previous psychiatric tests that had diagnosed Koptsev with a schizophrenic disorder. The experts concluded that the defendant had been unbalanced at the time of the attack.
Members of Russia's Jewish community hailed the longer sentence for Koptsev as an indication that the authorities were beginning to act on criticism from religious and rights groups, who claim the state has done little to tackle a surge in race-hate violence and xenophobia.
