A former president, Moscow's mayor and Putin's onetime bodyguard top the list to succeed the current leader.
The jailed opposition activist's wife has not has not been informed his whereabouts for over 30 days.
The opposition activist eyes support for aspiring local councillors
Navalny finished third in the Moscow mayoral elections in 2013.
The spectacle of a young rebel being arrested for blasphemy is a teaching aid the Kremlin loves to use to get its message across.
Kremlin intimidation has caused a "brain drain" says the daughter of slain Putin critic Boris Nemtsov.
Open Russia's online resources contains lectures on life in modern Russia.
Forty-two percent agree a coup has taken place via changes of law that favor corrupt officials.
Police have accused Khodorkovsky of being involved in a contract killing in 1998.
The former Yukos boss says he won't comply with the Kremlin's request to question him.
The protest will go on despite Navalny's recent imprisonment meaning he can't attend.
Alexei Navalny is planning a huge protest in Moscow on 1st March, and has been arrested several times in recent months.
Alexei Navalny and Mikhail Khodorkovsky will join forces next month in a protest against "the current regime".
Alexei Navalny was sentenced to house arrest, while his brother has been sent to jail for embezzlement charges