MOSCOW — Russian election officials on Monday barred the opposition leader Aleksei A. Navalny from running in next year’s presidential election, a widely expected decision that prompted him to call for his supporters to boycott the election and take part in street protests.

Twelve members of the 13-member Central Election Commission voted to bar Mr. Navalny from registering as a presidential candidate, citing his suspended prison sentence in a fraud case, a prosecution he has denounced as politically motivated. One member abstained from voting because of a possible conflict of interest.

The decision was not a surprise; election officials had previously said in interviews that he would be ineligible to run. Mr. Navalny, 41, was also prepared for the decision, recording his reaction in a video before it was officially announced.

“We won’t have an election because Vladimir Putin is horribly afraid, he sees a threat in competing with me,” Mr. Navalny said in the video. “He gave an instruction to his servants from the Central Electoral Commission to reject my registration.”