Vladimir Putin the Russian opposition and by international observers from the Organization for Security and Co-operation in Europe for procedural irregularities. Anti-Putin protests took place during and directly after the presidential campaign. The most notorious protest was the Pussy Riot performance on 21 February, and subsequent trial. An estimated 8,000–20,000 protesters gathered in Moscow on 6 May, when eighty people were injured in confrontations with police, and 450 were arrested, with another 120 arrests taking place the following day. A counter-protest of Putin supporters occurred which culminated in a gathering of an estimated 130,000 supporters at the Luzhniki Stadium, Russia's largest stadium.
2011–2013 Russian protests large attendance at the protest was not expected, and resulted in a traffic jam in a nearby Kutozovsky Avenue. The organizers of the protests applied to the Moscow authorities to gather 15,000 people, but since the number was exceeded, they were faced with paying a fine. Vladimir Putin, who earlier in the evening claimed to share the ideals of those who would go to Poklonnaya Hill, offered to pay part of the fine with his own money. The "anti-Orange protest" name alludes to the Orange Revolution in Ukraine, the most ill-known to Russians color revolution. The term "orange" in Russian