Russian ruble
Within days of the signing of the accession treaty, the process of integrating Crimea into the Russian federation began: in March the Russian ruble went into official circulation and clocks were moved forward to Moscow time, in April a new revision of the Russian Constitution was officially released with the Republic of Crimea and the federal city of Sevastopol included in the list of federal subjects of the Russian Federation, and in June the Russian ruble became the only form of legal tender. In July 2015, Russian Prime Minister Dmitry Medvedev stated that Crimea had been fully integrated into Russia.