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MOSCOW, RUSSIA - JULY 04: Security forces stand guard as Khamzat Bakhayev, Temirlan Eskerkhanov, Shadid Gubashev, Anzor Gubashev and Zaur Dadayev, who are convicted of organizing and carrying out the contract killing of opposition leader Boris Nemtsov, stand inside a glass defendant's cage during the trial in Moscow Military District Court in Moscow, Russia on July 04, 2017. Russia has jailed the killer of opposition leader Boris Nemtsov for 20 years, and handed four accomplices in the 2015 murder sentences ranging from 11 to 19 years. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA - JULY 04: Security forces stand guard as Khamzat Bakhayev, Temirlan Eskerkhanov, Shadid Gubashev, Anzor Gubashev and Zaur Dadayev, who are convicted of organizing and carrying out the contract killing of opposition leader Boris Nemtsov, stand inside a glass defendant's cage during the trial in Moscow Military District Court in Moscow, Russia on July 04, 2017. Russia has jailed the killer of opposition leader Boris Nemtsov for 20 years, and handed four accomplices in the 2015 murder sentences ranging from 11 to 19 years. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)