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.
Political career of Vladimir Putin in society, and a number of "anti-Orange" counter-protests (the name alludes to the Orange Revolution in Ukraine) and rallies of Putin supporters were carried out, surpassing in scale the opposition protests. On 4 March 2012, Putin won the 2012 Russian presidential elections in the first round, with 63.6% of the vote. While extraordinary measures were taken to make the elections transparent, including the usage of webcams on the vast majority of polling stations, the vote was criticized by Russian opposition and some international bodies for perceived irregularities.. Several heads of states around the world congratulated Putin on winning elections. Chinese