Navalny, 47, President Vladimir Putin's fiercest domestic critic, is already serving sentences totalling 11-1/2 years on fraud and other charges that he says are also bogus.
What is called 'Stalinist'," said Navalny, who is able to post on social media via his supporters and lawyers.
Who expect it and who are willing to make sacrifices for its birth," Navalny said, according to a text supplied by his aides.
Putin, in power since 1999, is expected to run for another six-year presidential term in 2024.
His supporters cast Navalny as a Russian version of South Africa's Nelson Mandela who will one day be freed from prison to govern the country.
Persons:
Alexei Navalny, Evgenia, Vladimir Putin's, Navalny, Putin, Africa's Nelson Mandela, Andrew Osborn, Gareth Jones, Conor Humphries
Organizations:
IK, REUTERS, Prosecutors, MOSCOW, Russia, West, CIA, Kremlin, Thomson
Locations:
Pokrov, Moscow, Russia, Melekhovo, Ukraine, Germany, Soviet