The Latest on anti-Putin protests in Russia (all times local):

2:55 p.m.

Russian police have detained opposition leader Alexei Navalny at a demonstration against President Vladimir Putin in central Moscow.

Thousands of demonstrators denouncing Putin's upcoming inauguration into a fourth term gathered Saturday in the capital's Pushkin Square.

Video showed police carrying a struggling Navalny, who is Putin's most prominent foe, out of the square, carrying him by the legs and arms.

The unauthorized protest was part of a day of nationwide demonstrations under the slogan "He is not our czar." Police made arrests at demonstrations in some other cities, but there was no overall figure immediately available.

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2:40 p.m.

Thousands of demonstrators crowded into one of Moscow's main squares on Saturday as part of nationwide protests against the upcoming inauguration of President Vladimir Putin to a new term.

Police in riot gear waded into the crowd on Pushkin Square and were seen grabbing some demonstrators and leading them away, but there were no immediate moves to disperse the unauthorized gathering. A helicopter hovered overhead to monitor the crowd.

The protests Saturday under the slogan "He is not our czar" are organized by Putin's most prominent foe, anti-corruption campaigner Alexei Navalny.

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12 p.m.

Demonstrators are holding protests throughout Russia against the upcoming inauguration of Vladimir Putin for a fourth term as Russian president.

The protests Saturday under the slogan "He is not our czar" are organized by Putin's most prominent foe, anti-corruption campaigner Alexei Navalny.

News reports and social media postings said protests had attracted hundreds or more in at least 10 cities in the Far East and Siberia. Some arrests by police were reported, but no overall figure was available.

Larger demonstrations are expected in the afternoon in Moscow, where protesters aim to hold an unauthorized march on one of the capital's main thoroughfares, and in St. Petersburg.

Putin will be inaugurated Monday for a six-year term.