Sevastopol, sometimes written Sebastopol, is the largest city in Crimea and a major port on the Black Sea. Due to its strategic location and the navigability of the city's harbours, Sevastopol has been an important port and naval base throughout its history. Since the city's founding in 1783 it has been a major base for Russia's Black Sea Fleet. During the Cold War of the 20th century, it was a closed city. The total administrative area is 864 square kilometres (334 sq mi) and includes a significant amount of rural land. The urban population, largely concentrated around Sevastopol Bay, is 479,394, and the total population is 547,820.
The Black Sea Fleet is the fleet of the Russian Navy in the Black Sea, the Sea of Azov and the Mediterranean Sea. The Black Sea Fleet, along with other Russian ground and air forces on the Crimean Peninsula, are subordinate to the Southern Military District of the Russian Armed Forces. The fleet traces its history to its founding by Prince Potemkin on 13 May 1783 as part of the Imperial Russian Navy. The Russian SFSR inherited the fleet in 1918; with the founding of the Soviet Union in 1922, it became part of the Soviet Navy. Following the collapse of the Soviet Union in 1991, the Black Sea Fleet was partitioned between the Russian Federation and Ukraine in 1997, with Russia receiving title to 82% of the vessels.
The Crimean People's Republic or Crimean Democratic Republic was a self-declared state that existed from December 1917 to January 1918 in the Crimean Peninsula. The Republic was one of many short-lived states that declared independence following the 1917 Russian Revolution caused the collapse of the Russian Empire.
The only presidential elections were contested in the Republic of Crimea for the post of President of Crimea, at the time a republic within Ukraine. The office was created by the Verkhovna Rada of Crimea, the republic's unicameral parliament October 13, 1993. Elections were subsequently held on January 16, 1994 with the second round on January 30 since a two-round system was used to elect the President. The presidential elections in Crimea were one of the most important precedents of the Crimean crisis that laid the basis for the Ukrainian-Russian international relationship.
The Agreement between Ukraine and Russia on the Black Sea Fleet in Ukraine, widely referred to as the Kharkiv Pact or Kharkov Accords, was a treaty between Ukraine and Russia whereby the Russian lease on naval facilities in Crimea was extended beyond 2017 until 2042, with an additional five-year renewal option in exchange for a multiyear discounted contract to provide Ukraine with Russian natural gas.
Russian Unity was a political party in Crimea, registered in October 2008. A Kyiv Court banned the party "from activity on the territory of Ukraine" on 30 April 2014. Party leader Sergey Aksyonov was instrumental in making possible the annexation of Crimea by the Russian Federation. The party was based in Crimea, which has a Russian-speaking majority. The party was dissolved on 5 May 2014.
The State Border of Ukraine is the international boundary of Ukraine, including ocean territory and airspace. The border is guarded by the State Border Guard Service of Ukraine and the Armed Forces of Ukraine.
A city with special status, formerly a "city of republican subordinance", is a type of first-level administrative division of Ukraine. Kyiv and Sevastopol are the only two such cities. Their administrative status is recognized in the Ukrainian Constitution in Chapter IX: Territorial Structure of Ukraine and they are governed in accordance with laws passed by Ukraine's parliament, the Verkhovna Rada. Most of Ukraine's 27 first-level administrative divisions are oblasts (regions).
The Russia–Ukraine border is the de jure international boundary between Russia and Ukraine. Over land, the border spans five Russian oblasts and five Ukrainian oblasts. Due to the ongoing Russo-Ukrainian War, which began in early 2014, the de facto border between Russia and Ukraine is different from the legal border recognized by the United Nations. As of 2024, Russia is militarily occupying a significant portion of Ukraine. Whereas, Ukraine is militarily occupying a very small portion of Russia.
The annexation of Crimea by the Russian Federation took place in the aftermath of the 2014 Ukrainian revolution. On 22–23 February, Russian President Vladimir Putin convened an all-night meeting with security services chiefs to discuss pullout of deposed President, Viktor Yanukovych, and at the end of that meeting Putin remarked that "we must start working on returning Crimea to Russia.". Russia sent in soldiers on February 27, 2014. Crimea held a referendum. According to official Russian and Crimean sources 95% voted to reunite with Russia. The legitimacy of the referendum has been questioned by the international community on both legal and procedural grounds.
The Autonomous Republic of Crimea is an administrative division of Ukraine encompassing most of Crimea that was unilaterally annexed by Russia in 2014. The Autonomous Republic of Crimea occupies most of the peninsula, while the City of Sevastopol occupies the rest.
In February and March 2014, Russia invaded the Crimean Peninsula, part of Ukraine, and then annexed it. This took place in the relative power vacuum immediately following the Revolution of Dignity. It marked the beginning of the Russo-Ukrainian War.
The Crimean problem or the Crimean question is a dispute over the status of Crimea between Ukraine and Russia.
The Treaty on Friendship, Cooperation, and Partnership between Ukraine and the Russian Federation, also known as the "Big Treaty", was an agreement signed in 1997 between Ukraine and Russia, which fixed the principle of strategic partnership, the recognition of the inviolability of existing borders, and respect for territorial integrity and mutual commitment not to use its territory to harm the security of each other. The treaty prevents Ukraine and Russia from invading one another's country respectively, and declaring war. Due to the beginning of the Russo-Ukrainian War in 2014, Ukrainian president Petro Poroshenko signed a decree not to extend the treaty on 19 September 2018. The treaty consequently expired on 31 March 2019.
The Treaty Between the Russian Federation and Ukraine on Cooperation in the Use of the Sea of Azov and the Kerch Strait is an agreement on sea and fisheries between Russia and Ukraine entered into force on 23 April 2004. It was signed on 24 December 2003 by President of Ukraine Leonid Kuchma and President of Russia Vladimir Putin and ratified by both parliaments in April 2004.
The Sevastopol Naval Base is an occupied naval base located in Sevastopol, in the disputed Crimean Peninsula. The base is used by the Russian Navy, and it is the main base of the Black Sea Fleet. Internationally it's recognised as Ukrainian land under Russian occupation.
A dispute over Tuzla Island in the Kerch Strait arose between Russia and Ukraine in 2003, sparked by unannounced Russian construction of a causeway from their side of the strait toward the island, which is Ukrainian territory. Russians offered various reasons for building the causeway, but Ukraine saw it as a threat to their territorial integrity. The dispute raised fears of an armed confrontation, but a settlement was negotiated.
Events in the year 2003 in Ukraine.
With the dissolution of the Soviet Union and Ukrainian independence the majority ethnic Russian Crimean peninsula was reorganized as the Republic of Crimea, after a 1991 referendum with the Crimean authorities pushing for more independence from Ukraine and closer links with Russia. In 1995 the Republic was forcibly abolished by Ukraine with the Autonomous Republic of Crimea established firmly under Ukrainian authority. There were also intermittent tensions with Russia over the Soviet Black Sea Fleet, although a 1997 treaty partitioned the Soviet Black Sea Fleet allowing Russia to continue basing its fleet in Sevastopol with the lease extended in 2010. Following the impeachment of the relatively pro-Russia Ukrainian President Viktor Yanukovych, Russia invaded Crimea, overthrew the elected autonomous government and claimed to annex it in 2014.
On 27 February 2014, unmarked Russian soldiers were deployed to the Crimean Peninsula in order to wrest control of it from Ukraine, starting the Russo-Ukrainian War. This military occupation, which the Ukrainian government considers to have begun on 20 February, laid the foundation for the Russian annexation of Crimea on 18 March 2014. Under Russia, the Ukrainian Autonomous Republic of Crimea was replaced by the Republic of Crimea, though the legitimacy of the latter is scarcely recognized internationally.
Partition Treaty on the Status and Conditions of the Black Sea Fleet at Wikisource 
