The Crimean problem (; ) or the Crimean question (; ) is a dispute over the status of Crimea between Ukraine and Russia.

The dispute began during the dissolution of the Soviet Union, but did not escalate into a conflict until the 2014 Ukrainian revolution, when Russian special forces were deployed to occupy Crimea and took over its government buildings.How Russia Took Crimea Macias, Amanda (2015). Business Insider. Retrieved 1 August 2017.Putin Admits Russian Forces Were Deployed to Crimea Reuters (2014). Retrieved 1 August 2017. The official results of an internationally unrecognized referendum held during the occupation allegedly indicated overwhelming support for Russian annexation. The Crimean parliament and the autonomous city of Sevastopol unilaterally declared independence from Ukraine to ideally form a country named Republic of Crimea. Russia then annexed the region and created two federal subjects, the Republic of Crimea (as a republic) and Sevastopol (as a federal city). Ukraine and the majority of the international community continue to regard Crimea as occupied Ukrainian territory; a United Nations General Assembly resolution declared the referendum invalid and affirmed the territorial integrity of Ukraine. Despite international opinion however, the currency, tax, time zone and legal system are all operational under de facto Russian control. Ukraine has attempted to resolve the matter by filing litigation in multiple international criminal, environmental, political (European Union), and other courts.

History In 1921, the Crimean Autonomous Soviet Socialist Republic was created as part of the Russian Soviet Federative Socialist Republic. Throughout its time the Soviet Union, Crimea underwent a population change. As a result of alleged collaboration with the Germans by Crimean Tatars during World War II, all Crimean Tatars were deported by the Soviet regime and the peninsula was resettled with other peoples, mainly Russians and Ukrainians. Modern experts say that the deportation was part of the Soviet plan to gain access to the Dardanelles and acquire territory in Turkey, where the Tatars had Turkic ethnic kin, or to remove minorities from the Soviet Union's border regions.

Nearly 8,000 Crimean Tatars died during the deportation, and tens of thousands perished subsequently due to the harsh exile conditions. The Crimean Tatar deportation resulted in the abandonment of 80,000 households and 145,600 hectares of land.

The autonomous republic without its titled nationality was downgraded to an oblast within the Russian SFSR on 30 June 1945.

On 19 February 1954, the oblast was transferred from the Russian SFSR to the Ukrainian SSR jurisdiction, on the basis of "the integral character of the economy, the territorial proximity and the close economic and cultural ties between the Crimea Province and the Ukrainian SSR" and to commemorate the 300th anniversary of Ukraine's union with Russia.Crimea profile – Overview BBC News. Retrieved 30 December 2015

From 1991, the territory was covered by the Autonomous Republic of Crimea and Sevastopol City within independent Ukraine. In 1994, Russia signed the Budapest Memorandum on Security Assurances, which states that it would "Respect Belarusian, Kazakh and Ukrainian independence, sovereignty, and the existing borders".

The Black Sea Fleet and Sevastopol

Post-independence, the dispute over control of the Black Sea Fleet and Sevastopol, the Crimean port city where the fleet was based, was a source of tensions for Russia–Ukraine relations. Until a final agreement was reached in 1997 with the signing of the Partition Treaty and Russian–Ukrainian Friendship Treaty, where Ukraine allowed Russia basing rights in Sevastopol and Crimea until 2017.

Crimea hosts Ukraine's largest ethnic Russian population, many of whom are retired military personnel or employees of the Russian Black Sea Fleet, especially in Sevastopol. Between 1992–1995, the dispute over the future of the fleet exacerbated internal frictions, with statements by Russian politicians encouraging separatist sentiments.

Sovereignty and geopolitics Despite being an independent country since 1991, the former Soviet republic Ukraine has been perceived by Russia as being part of its sphere of influence. Iulian Chifu and his co-authors claimed in a book that in regard to Ukraine, Russia pursued a modernized version of the Brezhnev Doctrine on "limited sovereignty", which dictates that the sovereignty of Ukraine cannot be larger than that of the Warsaw Pact prior to the demise of the Soviet sphere of influence. This claim is based on statements of Russian leaders that possible integration of Ukraine into NATO would jeopardize Russia's national security.

The issue resurfaced in late 2000s over Ukraine asserting its sovereignty and Russia's concern over its western orientation. In 2008, Russia used Sevastopol and the Black Sea Fleet in the Russo-Georgian War and ignored Ukraine regulations, leading to Ukrainian President Yushchenko's declaration that the lease deal would not be extended and that the fleet would have to leave Sevastopol by 2017. However, in 2010 president Yanukovych signed the Kharkiv Pact amidst Russia–Ukraine gas disputes.

In September 2013, Russia warned Ukraine that if it went ahead with a planned Association Agreement with EU, it would face consequences. Sergey Glazyev, adviser to President Vladimir Putin, said that, "Ukrainian authorities make a huge mistake if they think that the Russian reaction will become neutral in a few years from now. This will not happen." Glazyev allowed for the possibility of separatist movements springing up in the Russian-speaking east and south of Ukraine.

Evolution of status of the Crimean Peninsula within independent Ukraine Crimean ASSR and Republic of Crimea After the Crimean referendum of 1991, which asked whether Crimea should be elevated to a signatory of the New Union Treaty (that is, become a union republic on its own), the Ukrainian SSR restored Crimea's autonomous status (Crimean Autonomous SSR), but confirmed that autonomy restored as a part of the Ukrainian SSR. The Crimean Oblast council became Supreme Council of Crimea and, on 4 September 1991, passed the Declaration of state sovereignty of Crimea.

Following the dissolution of the Soviet Union, the ASSR renamed itself the Republic of Crimea. The Ukrainian government initially accepted its name, but not its claims to be a state. According to Ukrainian law "On status of the autonomous Republic of Crimea", passed on 29 April 1992, "Republic of Crimea is an autonomous part of Ukraine and independently decides on matters, of its application of the Constitution and laws of Ukraine" (art. 1).Про статус автономної Республіки Крим. Закон від 29.04.1992 № 2299-XII The Regional Supreme Council, on the contrary, insisted that "Republic of Crimea is a legal democratic state", which "has supremacy in respect to natural, material, cultural and spiritual heritage" and "exercises its sovereign rights and full power" on its territory (art. 1 of the May 1992 Constitution), but also a "part of Ukraine and establishes relations in it on a basis of the treaty and agreements" (art. 9).Конституция Республики Крым Both Ukrainian law on autonomy statusПро внесення змін і доповнень до Закону України "Про статус автономної Республіки Крим" Верховна Рада України; Закон від 30.06.1992 № 2523-XII and the 1992 Constitution of CrimeaО внесении изменений и дополнений в Конституцию Республики Крым. Верховная Рада АРК; Закон от 25.09.1992 № 155–1 were amended later that year, putting the Republic's status in between what was proposed in the initial revision of the 1992 Constitution and what was proposed in April 1992 Ukrainian law on the status of the Republic.

On 21 May 1992 the Supreme Soviet of Russia declared 1954 transfer of Crimea as having "no legal force", because it was adopted "in violation of the Constitution (Fundamental Law) of the Russian SFSR and legislative process", but because subsequent legislation and the 1990 Russo-Ukrainian treaty constituted that fact, parliament considered it necessary to resolve the Crimean question in negotiations between Ukraine and Russia and on the basis of the popular will of the inhabitants of Crimea. A similar resolution was adopted for Sevastopol a year later. Both moves were condemned by Ukraine and resulted in no changes to the Russian Constitution (neither 1978 nor 1993 documents enumerated Crimea and Sevastopol as federal subjects).

In 1994, after parliamentary and presidential elections in the Republic, the Supreme Council and the executive became dominated by the Russian Bloc (which had won 57 seats in the Supreme Council of Crimea and Presidency for its member, Yuri Meshkov).Полунов, Александр Юрьевич. Общественные организации русского Крыма: политическая деятельность, стратегии взаимоотношений с властью . Государственное управление. Выпуск № 21. Декабрь 2009 года. Following a referendum, held in the same year, the Supreme Council of Crimea restored the 1992 Constitution to its original revision.О восстановлении конституционных основ государственности Республики Крым. Верховная Рада АРК; Закон от 20.05.1994 № 32–1

Autonomous Republic of Crimea A year later, the 1992 Crimean constitution, along with the presidency and regional citizenship, was declared null and void by the Ukrainian Parliament, which by that time, had renamed the area from "Republic of Crimea" to Autonomous Republic of Crimea.Про внесення змін і доповнень до Конституції (Основного Закону) України. Верховна Рада України; Закон від 21.09.1994 № 171/94-ВР Another Constitution was passed by Crimean parliament in 1995,Конституция Автономной Республики Крым. Верховная Рада АРК; Закон, Конституция от 01.11.1995 № 611k-1 but many parts of it were rejected by the Ukrainian parliament; among them were the republic's name (which was to remain "Republic of Crimea") and citizenship.Про Конституцію Автономної Республіки Крим. Верховна Рада України; Закон від 04.04.1996 № 117/96-ВР Meanwhile, during drafting of the new Ukrainian Constitution, the question of autonomy was much debated: some legislators proposed abolishing it altogether (downgrading back to oblast status or to autonomy but not autonomous republic),Table of amendments to the 11 March 1996 draft Ukrainian Constitution while other legislators proposed legalising the 1992 Constitution of Crimea provisions (original May revision) in the new Ukrainian Constitution. Ultimately, the new Constitution of Ukraine adopted neither extreme and reiterated the autonomous status of the republic, while downgrading some of its powers (such as the regional Supreme Council's powers to enact legislation in form of laws ("zakoni")). The Republic was declared to be the "Autonomous Republic of Crimea", but also an "inseparable constituent part of Ukraine". A new Crimean constitution, complying with provisions of the Ukrainian one, was adopted in 1998.

Status of Sevastopol