The question of the ownership of Crimea has been a point of contention between Russia and Ukraine.
Historically, in 1949 the Crimean Khanate was established, which was subordinate to the then Mongol Golden Horde (the end of the four Mongol khanates?）。
In 1783, Crimea was incorporated into Tsarist Russia, and in 1921 the Crimean Autonomous Socialist Republic was established.
During the Soviet era, Crimea was annexed to Ukraine in 1954, which also laid the groundwork for the future dispute over the ownership of Crimea.
After the collapse of the Soviet Union, Crimea became the only autonomous republic in Ukraine through a referendum, while the main base of Russia's Black Sea Fleet was stationed in the Crimean port city of Sevastopol.
In 2014, Crimea held a referendum to decide whether Crimea would reunite with Russia as a federal subject.
On March 16, the results of the referendum were announced, about 97% of the votes were in favor of joining Russia, and Putin signed the "Decree on the Recognition of the Republic of Crimea" on the 17th, recognizing the Republic of Crimea (including the city of Sevastopol) as a sovereign and independent state, and on the 18th, the Prime Minister, the Speaker of the Parliament and the Mayor of the Republic of Sevastopol signed a treaty, and the Republic of Crimea (including the city of Sevastopol) officially joined the Russian Federation and formed a new federal subject.
But for the decision of the referendum, Kiev*** of Ukraine expressed firm opposition, and said that the referendum was unconstitutional and illegal, so the dispute over the ownership of Crimea will always exist.
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