Russian opposition leader Navalny expected in Moscow court

A protester with trainers on his neck, which has become symbol of corruption, is detained in Moscow on Sunday, March 26, 2017. The protests Sunday focused on reports by Navalny's group claiming that Prime Minister Dmitry Medvedev has amassed a collection of mansions, yachts and vineyards. The alleged luxuries include a house for raising ducks, so many placards in Sunday's protests featured mocking images of yellow duck toys. (AP Photo/Alexander Zemlianichenko) (The Associated Press)

Police help a wounded comrade during fighting with protesters in Pushkin Square, downtown Moscow, Russia, Sunday, March 26, 2017. Thousands of people crowded into Moscow's Pushkin Square on Sunday for an unsanctioned protest against the Russian government, the biggest gathering in a wave of nationwide protests that were the most extensive show of defiance in years. (AP Photo/Artem Lunev) (The Associated Press)

In this handout photo provided by Alexei Navalny, Russian opposition leader Alexei Navalny makes a selfie inside a court room in Moscow, Russia, Monday, March 27, 2017. Russian opposition leader Alexei Navalny is making a court appearance Monday, a day after being detained at a major opposition rally the previous day. Tens of thousands of protesters took to the streets across Russia on Sunday in the biggest show of defiance since the 2011-2012 anti-government protests.(Alexei Navalny/ photo via AP) MANDATORY CREDIT (The Associated Press)

Russian opposition leader Alexei Navalny is expected to make a court appearance after being detained at a major opposition rally the previous day.

Tens of thousands of protesters took to the streets across Russia on Sunday in the biggest show of defiance since the 2011-2012 anti-government protests.

Almost all of Sunday's rallies were unsanctioned. A group that monitors political repression, OVD-Info, published a list early Monday of more than 1,000 people arrested at the Moscow rally. This number can't be immediately verified, and the Moscow police previously reported half as many arrests.

Sunday's protests were led by Navalny, a charismatic opposition leader who has recently announced his bid for presidency. Navalny was detained while walking to the rally from a nearby subway station.