"I will continue for the freedom of my country," Navalny says. The opposition leader was sentenced to 19 years in prison for "extremism" He was found dead in a hotel room in the town of Yekaterinburg, Russia, on Friday.

He was one of the most vocal critics of Russian President Vladimir Putin, who is facing re-election in March. The Kremlin has denied that he was involved in the death of his wife, who was found in a bathtub full of water.