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.
Vladimir Putin totalled 2 million rubles (approximately $80,000). In 2012, Putin reported an income of 3.6 million rubles ($113,000). According to Russian opposition politicians and journalists, Putin secretly possesses a multibillion-dollar fortune via successive ownership of stakes in a number of Russian companies. However, according to one editorial in "The Washington Post", "Estimates of Putin's wealth lack even the smallest thread of evidence." In April 2016, 11 million documents belonging to Panamanian law firm Mossack Fonseca were leaked to the German newspaper "Süddeutsche Zeitung" and the Washington-based International Consortium of Investigative Journalists. The name of Vladimir Putin does not appear in any