May 5, in more than 80 cities of Russian Federation held rallies in connection with the fourth inauguration of President Putin with the slogan "He's not our king".
Judge Dmitry Gordeyev of Moscow's Tverskoi district court found Navalny guilty of arranging the "unauthorised protests".
He was barred from running in the most recent election as a result and called for a boycott of the vote.
The police officer said Navalny ignored megaphone warnings that the protest was illegal.
"The authorities have started forming a government and now are striving by any means to deprive Navalny of freedom, to prevent him reacting to this process".
The anti-corruption campaigner, who has become Putin's most visible political foe, already has served several weeks-long jail terms for organizing other protests.
Navalny himself was grabbed by police and carried away by his arms and legs shortly after appearing in Moscow's packed Pushkin square.
The court also was expected to rule on another administrative case against Navalny involving charges of disobedience to police, which carries a punishment of 15 days in prison. "On the basis of provisions of the Russian Code on Administrative Offences and the Supreme Court's clarifications, the enforcement of arrest begins on the day the relevant ruling is handed down".
"They gave me 30 days, and the "trial" is still going", Navalny tweeted after the initial ruling.
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