The ousting of Ukrainian president Viktor Yanukovych during the 2014 Ukrainian revolution initiated a chain of events that culminated in a referendum in Crimea on whether it should rejoin Russia. Days after the official results revealed overwhelming support for the proposal, Russia signed a Treaty of Accession with the self-declared independent Republic of Crimea that annexed Crimea to the Russian Federation. While the Russian Federation both claims and administers the Republic of Crimea and the city of Sevastopol as two of its federal subjects, Ukraine continues to assert that Crimea is an integral part of its territory.