Demonstrasjonene mot Vladimir Putins regime antar et omfang som gjør dem til en utfordring. President-valget i mars er ikke lenger like gitt.

120.000 demonstrerte i Moskva lørdag, utenkelig for bare noen uker siden.

Tidligere finansminister Kudrin, som stiller til valg, sier at parlamentsvalget ikke gikk ordentlig for seg. Det er andre ord for valgfusk.

The first such demonstration, two weeks ago, was unprecedented for Mr. Putin’s rule, and there were reasons Saturday’s turnout could have been lower — among them, winter holidays and the onset of bitter cold.

Instead, people poured all afternoon into a canyon created by vast government buildings, and the police put the crowd at 30,000, more than they reported on Dec. 10. Organizers said it was closer to 120,000. Hours later, as the protesters dispersed, they chanted, slowly: “We will come again! We will come again!”

If the movement sustains its intensity, it could alter the course of the presidential election in March, when Mr. Putin plans to extend his stretch as the country’s dominant figure to an eventual 18 years. Opposition voters were furious over the conduct of this month’s parliamentary election, and will be roused again by Mr. Putin’s campaigning. Still, maintaining momentum is a huge challenge, and the initial giddy mood has already hardened into something more serious.

Noe er løs, demonstrasjonenen er utløp for en stemning blant folk. Det kan alle se.

The crime novelist Boris Akunin, peering out through wire-rimmed glasses as he addressed the crowd from a stage, said demonstrators should prepare themselves for a long haul.

“We will have a difficult year,” Mr. Akunin said. “But it will be an interesting year. It will be our year.”

The protests have rattled the Kremlin, which has not encountered widespread political resistance for a decade. Mr. Putin initially sneered at the demonstrators, saying days after the first rally that the white ribbons they have adopted as a symbol resembled limp condoms, and that they participated only because they were paid by foreign agents seeking to undermine Russia.

Vast Rally in Moscow Is a Challenge to Putin’s Power

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