In the 1994 Budapest Memorandum on Security Assurances Russia was among those who affirmed 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. The 1997 Russian–Ukrainian Treaty on Friendship, Cooperation, and Partnership again reaffirmed the inviolability of the borders between both states, and required Russian forces in Crimea to respect the sovereignty of Ukraine, honor its legislation and not interfere in the internal affairs of the country. The Russian–Ukrainian Partition Treaty on the Status and Conditions of the Black Sea Fleet signed in 1997 and prolonged in 2010, determined the status of Russian military presence in Crimea and restricted their operations, including requirement to show their "military identification cards" when crossing the international border and that operations beyond designated deployment sites was permitted only after coordination with Ukraine. According to Ukraine usage of navigation stations and troop movements were improperly covered by the treaty and were violated many times as well as related court decisions. February's troop movements were in "complete disregard" of the treaty. 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 and shall take place pursuant to an international treaty between the two countries; moreover, it must be initiated by the state in question, not by its subdivision or by Russia. On 28 February 2014, Russian MP Sergey Mironov, along with other members of the Duma, introduced a bill to alter Russia's procedure for adding federal subjects. According to the bill, accession could be initiated by a subdivision of a country, provided that there is "absence of efficient sovereign state government in foreign state"; the request could be made either by subdivision bodies on their own or on the basis of a referendum held in the subdivision in accordance with corresponding national legislation. On 11 March 2014, both the Supreme Council of Crimea and the Sevastopol City Council adopted a declaration of independence, which stated their intent to declare independence and request full accession to Russia should the pro-Russian option receive the most votes during the scheduled status referendum. The declaration