Political status of Crimea declared their independence from Ukraine as a single united state under the name of "Republic of Crimea". These two entities (Crimea and Sevastopol) were then annexed by Russia, where the Crimean Autonomous Republic became the "Republic of Crimea" as a Russian republic and Sevastopol became a Russian federal city. However, Ukraine and the majority of the international community do not consider the merge, the independence, the referendum, nor the annexation legitimate and still consider both entities as parts of Ukraine. Despite international opinion however, the currency, tax and legal system are all operational under Russian jurisdiction. Ukraine has applied for
Annexation of Crimea by the Russian Federation also signed the Budapest Memorandum on Security Assurances, by which all these countries reaffirmed their obligation to respect the territorial integrity of Ukraine (including Crimea) and to refrain from the threat or use of force against the territorial integrity or political independence of Ukraine. According to the Constitution of Russia, the admission of new federal subjects is governed by federal constitutional law (art. 65.2). Such a law was adopted in 2001, and it postulates that admission of a foreign state or its part into Russia shall be based on a mutual accord between the Russian Federation and the relevant state