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MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny attends a live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny attends a live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

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MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny is seen following his live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny is seen following his live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017.

 (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

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MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny is seen following his live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA- DECEMBER 27 : Russian opposition leader Alexei Navalny is seen following his live broadcast at the Echo of Moscow, a Russian radio station, in Moscow, Russia on December 27, 2017.

 (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

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MOSCOW, RUSSIA - JULY 07: Russian opposition leader Alexei Navalny speaks to media in his office, after being released from jail aftermath of 25 days in jail for organising unauthorised protests in Moscow, Russia on July 07, 2017. (Photo by Nikita Shvetsov/Anadolu Agency/Getty Images)

MOSCOW, RUSSIA - JULY 07: Russian opposition leader Alexei Navalny speaks to media in his office, after being released from jail aftermath of 25 days in jail for organising unauthorised protests in Moscow, Russia on July 07, 2017.  (Photo by Nikita Shvetsov/Anadolu Agency/Getty Images)

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SAINT-PETERSBURG, RUSSIA - OCTOBER 7 : Russian security forces take a demonstrator into custody during an unauthorized anti-Kremlin rally called by opposition leader Alexei Navalny, who is serving a 20-day jail sentence, in Saint-Petersburg, Russia on October 7, 2017, President Vladimir Putin's 65th birthday. (Photo by Igor Russak/Anadolu Agency/Getty Images)

SAINT-PETERSBURG, RUSSIA - OCTOBER 7 : Russian security forces take a demonstrator into custody during an unauthorized anti-Kremlin rally called by opposition leader Alexei Navalny, who is serving a 20-day jail sentence, in Saint-Petersburg, Russia on October 7, 2017, President Vladimir Putin's 65th birthday. (Photo by Igor Russak/Anadolu Agency/Getty Images)