Navalny likened his detention conditions to "Orwell's 1984" in an Instagram post on Monday.
Police raided the home of activist Lyubov Sobol on Christmas day after she knocked at the door of an alleged FSB agent who Alexei Navalny says took part in the plot to poison him.
He made the claim during his annual marathon press conference on Thursday.
The Russian president said he asked the country's Prosecutor General to immediately allow opposition figure Alexei Navalny to be moved to Germany for urgent treatment.
In video posted on Instagram, Alexei Navalny, who was poisoned with Novichok, can be seen up and about and walking down stairs in the Berlin hospital where he is being treated.
Before being poisoned, Kremlin critic Alexei Navalny was urging Russians to vote tactically by casting their ballot for candidates best placed to defeat the ruling United Russia party.
Moscow municipal deputy and associate of Alexei Navalny, Konstantin Jankauskas, tells Euronews he refutes the claim that no poison was found in the opposition politician's blood.
Hundreds of people were arrested as protesters gathered in Moscow on Saturday to demand free and fair elections.