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.
Cathedral of the Immaculate Conception (Moscow) headed the restoration of the Catholic Assumption Cathedral in St. Petersburg. (Stetskevich later rose to become vicar general of the Roman Catholic Archdiocese of Moscow.) The interior fittings and the new altar were built by Ukrainian, Belarusian and Russian experts. Companies in Moscow carried out all the internal and external marble work. The church furnishings were produced, under the direction of Vladimir Mukhin, by students from the St. Petersburg renovating school. Stained glass for the façade's rose window were made in Toruń, other windows were produced by Tolotschko, a Belarusian company from Hrodna. The Cathedral of the Immaculate Conception was