A court in Moscow has ruled that outspoken Kremlin critic Aleksei Navalny must pay a 10,000 ruble ($275) fine for chanting antipolice statements in front of the court last week.
Navalny was released on March 3 after serving a seven-day jail term for disobedience to police at the same gathering.
He said at the trial that he considers both court rulings against him as an attempt to send him to jail.
He is currently serving a five-year suspended sentence on a theft conviction, which he calls politically motivated.
Last week, Navalny was put under pretrial house arrest until April 28 while a probe continues against him and his brother Oleg in a separate case linked to alleged embezzlement and money laundering.
Navalny insists the charges amount to Kremlin reprisal for his critical statements.
Based on reporting by Interfax and ITAR-TASS