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.
Dormition Cathedral, Moscow become dilapidated, and in 1472 the Moscow architects Kryvtsov and Myshkin began construction of a new cathedral. Two years later, in May 1474, the building was nearing completion when it collapsed due to earthquake. Following the disaster, Ivan III then invited Aristotele Fioravanti, a celebrated architect and engineer from Bologna, Italy, to come to Moscow and entrusted him with the task of designing the cathedral from scratch in the traditions of Russian architecture. The Assumption Cathedral in Vladimir was once again taken as a model for the building, and so Fioravanti travelled to Vladimir in order to study Russian methods