MOSCOW (AP) — 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.