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 named the overcoming of consequences of the world economic crisis one of the two main achievements of his 2nd Premiership (the other named achievement being the stabilisation of the size of Russia's population between 2008-2011 following the long period of demographic collapse started in the 1990s). At the United Russia Congress in Moscow on 24 September 2011, Medvedev officially proposed that Putin stand for the Presidency in 2012; an offer which Putin accepted. Given United Russia's near-total dominance of Russian politics, many observers believed that Putin was all but assured of a third term. The move was expected to see