Released a week ago from the Berlin Charité Hospital, Russian opponent Alexeï Navalny accused President Vadimir Poutine in Der Spiegel, a German weekly, of being "behind" his poisoning.

He also assured that he was "not afraid" and wanted to return to Russia once healed.

Russian opponent Alexeï Navalny accused President Vadimir Putin of being "behind" his poisoning, in his first interview published since he left the German hospital where he was treated.

"I affirm that Putin is behind this act, I see no other explanation," he told the German weekly

Der Spiegel

, which published extracts of the interview on its website Thursday morning. .

"I am not afraid"

"My duty now is to remain as I am, someone who is not afraid. And I am not afraid!", Also affirms the main opponent of the Kremlin.

According to the German weekly, he also confirms in the interview, the entirety of which is to be broadcast later today, his intention to return to Russia once healed.

A tireless anti-corruption activist and fierce critic of the Kremlin, Alexeï Navalny, 44, fell seriously ill on August 20 on a plane in Siberia while on an election campaign.

Three European laboratories concluded that it was poisoned with a Novichok-type nerve agent, designed for military purposes in Soviet times, and Western capitals therefore called on Russia to explain and investigate.

Moscow rejects all accusations.

Alexeï Navalny was released a week ago from the Berlin Charité hospital, where he was treated for a month.

He is now continuing his convalescence in Germany which, according to his spokesperson, will take "a long time".