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.
Happy Birthday, Mr. Putin! Happy Birthday, Mr. Putin! Happy Birthday, Mr. Putin! is an English title of the erotic calendar, released by the Russian publishing house "Fakultet" for the 58th birthday of Vladimir Putin on October 7, 2010. The calendar features twelve semi-nude female students of journalism faculty at the Moscow State University (MSU), each for every month, with a short message. The print run consisted of 50,000 copies. The calendar caused a stir in the international media. In a less than one day the images from the calendar have been reposted from its original web source by several thousands Russian users of LiveJournal.